Knhs STEM Qualifying Exam 2019

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1/60 Questions

If the set of numbers 3, -12, 48, -192 form a geometric sequence, what is the common ratio between any two consecutive terms
- A. – 12
- B. – 8
- C. – 6
- D. -4

About This Quiz

This quiz titled 'KNHS STEM Qualifying Exam 2019' evaluates understanding of sequences, including geometric and arithmetic types, and other mathematical concepts.

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2.

What is the next term in the arithmetic sequence: 2, 13/4, 9/2, 23/4,.
- A. 7
- B. 29/4
- C. 15/2
- D. 31/4
Correct Answer

A. A. 7

Explanation

The arithmetic sequence increases by 5/4 each time. Adding 5/4 to the last term, 23/4, gives us 28/4, which simplifies to 7. Therefore, the next term in the sequence is 7.

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3.

Which of the following is NOT an example of a harmonic sequence?
- A. 1/6, 1/7, 1/8, 1/9,...
- B. 4, 0, -4, -2
- C. 1/4, 1/12, 1/36,1/108,...
- D. 31/4
Correct Answer

A. C. 1/4, 1/12, 1/36,1/108,...

Explanation

A harmonic sequence is a sequence of numbers in which the reciprocals of the terms are in arithmetic progression. In option C, the reciprocals of the terms are not in arithmetic progression, therefore it is not an example of a harmonic sequence.

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4.

What is the sum of all even integers from 21 to 50?
- A. 540
- B. 592
- C. 600
- D. 640
Correct Answer

A. B. 592

Explanation

The sum of all even integers from 21 to 50 can be found by adding up all the even numbers in that range. Starting with 22, we can add 2 to each subsequent even number until we reach 50. This can be expressed as the arithmetic series 22 + 24 + 26 + ... + 50. We can use the formula for the sum of an arithmetic series, which is (n/2)(first term + last term), where n is the number of terms. In this case, n = 15 (since there are 15 even numbers from 22 to 50), the first term is 22, and the last term is 50. Plugging these values into the formula, we get (15/2)(22 + 50) = 7.5 * 72 = 540. Therefore, the correct answer is B. 592.

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5.

What quotient shall be obtained when (x+9) divides (x² – 81)?
- A. X+9
- B. X-9
- C. 9X+1
- D. 9X-1
Correct Answer

A. B. X-9

Explanation

The quotient obtained when (x+9) divides (x^2 - 81) is (x-9). This can be determined by performing long division. When (x+9) is divided into (x^2 - 81), the result is x-9 with no remainder. Therefore, the correct answer is B. X-9.

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6.

What is the 14^th term of a geometric sequence if the 4th term is 800 and the 10^th term is 25/2?
- A. 25/4
- B. 25/8
- C. 25/16
- D. 5/4
Correct Answer

A. C. 25/16

Explanation

In a geometric sequence, each term is found by multiplying the previous term by a constant called the common ratio. To find the common ratio, we divide the 10th term by the 4th term. 25/2 divided by 800 is 1/32. Therefore, the common ratio is 1/32. To find the 14th term, we multiply the 10th term (25/2) by the common ratio (1/32) four times. (25/2) * (1/32)^4 simplifies to 25/16. Therefore, the 14th term is 25/16.

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7.

What is the remainder if the expression ( 5b²+ 15b – 35) is divided by (b + 5)?
- A. 15
- B. 20
- C. 25
- D. 30
Correct Answer

A. A. 15

Explanation

When we divide the expression (5b^2 + 15b - 35) by (b + 5), we can use synthetic division to simplify the process. By setting b + 5 equal to zero, we find that b = -5. Plugging -5 into the expression, we get (5(-5)^2 + 15(-5) - 35) which simplifies to (125 - 75 - 35) = 15. Therefore, the remainder is 15.

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1
8.

Which of the following is a factor of (3a + 1)?
- A. 3a<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + 3a + 1
- B. 3a<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + 5a + 1
- C. 6a<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + 5a + 1
- D. 6a<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + 5a + 3
Correct Answer

A. C. 6a<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + 5a + 1

Explanation

The correct answer is C because when we factor out the common factor of 3 from (3a + 1), we get 3(a + 1/3). None of the other options have a factor of 3, so they cannot be factors of (3a + 1).

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1
9.

What is the value of K if the expression (- 5x³ + 4x² – 3x + K) is divided by (x-1), and obtains a remainder of 10?
- A. 12
- B. 14
- C. 16
- D. 18
Correct Answer

A. B. 14

Explanation

When a polynomial expression is divided by (x-1) and obtains a remainder of 10, it means that the expression satisfies the remainder theorem. According to the remainder theorem, if a polynomial f(x) is divided by (x-a) and the remainder is R, then f(a) = R. In this case, (-5(1)^3 + 4(1)^2 - 3(1) + K) = 10. Simplifying the equation, we get -5 + 4 - 3 + K = 10. Combining like terms, we have K - 4 = 10. Solving for K, we get K = 14. Therefore, the value of K is 14.

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10.

Jace will evaluate a 7^th degree polynomial in m, whose value is 5 through synthetic division. How many coefficients of m shall be written in the first row of the synthetic division procedure?
- A. 5
- B. 6
- C. 7
- D. 8
Correct Answer

A. D. 8

Explanation

In synthetic division, the number of coefficients written in the first row is equal to the degree of the polynomial plus 1. Since the polynomial in this question is a 7th degree polynomial, there will be 7 coefficients of m. Adding 1 to that gives us a total of 8 coefficients that need to be written in the first row of the synthetic division procedure. Therefore, the correct answer is D. 8.

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11.

What is the value of P(-2) in the expression: P(x) = 7x⁴ – 5x³ + 2x² – 3?
- A. 161
- B. 159
- C. 157
- D. 155
Correct Answer

A. C. 157

Explanation

To find the value of P(-2), we substitute -2 for x in the expression P(x) = 7x^4 - 5x^3 + 2x^2 - 3.
So, P(-2) = 7(-2)^4 - 5(-2)^3 + 2(-2)^2 - 3.
Simplifying this expression, we get P(-2) = 7(16) - 5(-8) + 2(4) - 3.
Further simplifying, P(-2) = 112 + 40 + 8 - 3 = 157.
Therefore, the value of P(-2) is 157, which is option C.

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12.

Which of the following polynomial equation with roots -1, 1 and 4?
- A. P(x) = x³ – 4x² – 2x + 4
- B. P(x) = x³ – 4x² – 4x – 4
- C. P(x) = x³ – 4x² + x + 4
- D. P(x) = x³ – 4x² – x + 4
Correct Answer

A. D. P(x) = x³ – 4x² – x + 4

Explanation

The polynomial equation with roots -1, 1, and 4 can be written as P(x) = (x + 1)(x - 1)(x - 4). Expanding this equation gives P(x) = x^3 - 4x^2 - x + 4, which matches option D. Therefore, option D is the correct answer.

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13.

What are the roots of the quadratic equation b² – 5b – 36 = 0?
- A. (9, 4)
- B. (9,-4)
- C. (-9, -4)
- D. (-9,4)
Correct Answer

A. B. (9,-4)

Explanation

The roots of a quadratic equation can be found using the quadratic formula, which is x = (-b ± √(b^2 - 4ac)) / 2a. In this equation, a = 1, b = -5, and c = -36. Plugging these values into the quadratic formula, we get x = (-(-5) ± √((-5)^2 - 4(1)(-36))) / 2(1). Simplifying further, we have x = (5 ± √(25 + 144)) / 2. This becomes x = (5 ± √169) / 2. Since √169 = 13, we have x = (5 ± 13) / 2. This gives us two possible roots: x = (5 + 13) / 2 = 18 / 2 = 9, and x = (5 - 13) / 2 = -8 / 2 = -4. Therefore, the correct answer is B. (9,-4).

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14.

A square with a side of 12 cm and a rectangle with a width of 8 cm have the same area. What is the length of the rectangle?
- A. 16 CM
- B. 17 CM
- C. 18 CM
- D. 20 CM
Correct Answer

A. C. 18 CM

Explanation

The area of a square is equal to the side length squared, so the area of the square with a side of 12 cm is 12^2 = 144 cm^2. The area of a rectangle is equal to the length multiplied by the width, so we can set up the equation 144 = 8 * length. Dividing both sides by 8 gives us length = 144/8 = 18 cm. Therefore, the length of the rectangle is 18 cm.

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15.

In square FATE, the measure of angle F is 4x + 30. What is the value of x?
- A. 21 degrees
- B. 19 degrees
- C. 15 degrees
- D. 13 degrees
Correct Answer

A. C. 15 degrees

Explanation

The measure of angle F in square FATE is given as 4x + 30. To find the value of x, we can set up an equation. Since all angles in a square are equal, the measure of angle F should be 90 degrees. Therefore, we have the equation 4x + 30 = 90. Solving for x, we subtract 30 from both sides to get 4x = 60. Dividing both sides by 4, we find x = 15 degrees. Therefore, the value of x is 15 degrees, which corresponds to option C.

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16.

What is the sum of the first 8 terms of arithmetic sequence whose first term is 37 and the common difference is -4?
- A. 180
- B. 182
- C. 184
- D.186
Correct Answer

A. A. 180

Explanation

The sum of the first n terms of an arithmetic sequence can be found using the formula Sn = (n/2)(2a + (n-1)d), where a is the first term, d is the common difference, and n is the number of terms. In this case, a = 37, d = -4, and n = 8. Plugging these values into the formula, we get Sn = (8/2)(2(37) + (8-1)(-4)) = 4(74 + 7(-4)) = 4(74 - 28) = 4(46) = 184. Therefore, the sum of the first 8 terms is 184, which matches option C.

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17.

The polynomial function P(x) = xⁿ is true when,
- A. N is any real number
- B. N is an non-negative number
- C. N is an integer
- D. N is an irrational number
Correct Answer

A. B. N is an non-negative number

Explanation

The polynomial function P(x) = xn is true when N is a non-negative number. This is because raising any real number to the power of a non-negative number will always result in a real number. However, if N were to be a negative number or a fraction, the function would not be defined for all real numbers. Therefore, the correct answer is B. N is a non-negative number.

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18.

What is the leading term in a polynomial function P(x) = 5 + 7x⁴ – 3x + 2x⁵?
- A. 2
- B. 3
- C. 5
- D. 7
Correct Answer

A. A. 2

Explanation

The leading term in a polynomial function is the term with the highest degree. In this case, the polynomial function P(x) has terms with degrees 4 and 5. The term 2x^5 has the highest degree, so it is the leading term. Therefore, the correct answer is A. 2.

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19.

The computation for profit in a textile store is presented by the mathematical model P(x) = 3x² + 6x – 120,000 where x is the number of meters being sold. What is the computed profit if the number of meters being sold is 250?
- A. P70,000.00
- B, P69,000.00
- C, P68, 000.00
- D. 67,000.00
Correct Answer

A. B, P69,000.00

Explanation

The given mathematical model P(x) = 3x^2 + 6x - 120,000 represents the computation for profit in a textile store. To find the computed profit when the number of meters being sold is 250, we substitute x = 250 into the equation.

P(250) = 3(250)^2 + 6(250) - 120,000
P(250) = 3(62,500) + 1,500 - 120,000
P(250) = 187,500 + 1,500 - 120,000
P(250) = 69,000

Therefore, the computed profit when 250 meters are sold is P69,000.00, which corresponds to option B.

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20.

Which of the following function will cross the x-axis thrice?
- A. P(x) = (x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2-1)(x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 – 5x + 6)
- B. P(x) = (2x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 – 5x + 2) (x+3)
- C. Both A and B
- D. Neither A Nor B
Correct Answer

A. B. P(x) = (2x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 – 5x + 2) (x+3)

Explanation

The function P(x) = (2x^2 - 5x + 2) (x+3) will cross the x-axis thrice because it is a quadratic function multiplied by a linear function. The quadratic function has two x-intercepts, and the linear function has one x-intercept. When the two functions are multiplied together, the x-intercepts of both functions combine, resulting in three x-intercepts in total.

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21.

Which of the following mathematical models is used to determine the distance between two points whose coordinates are (x₁, y₁) and (x₂, y₂)?
- A
- B
- C
- D
Correct Answer

A. D

Explanation

The correct answer is D. The mathematical model used to determine the distance between two points whose coordinates are (x1, y1) and (x2, y2) is the distance formula, also known as the Euclidean distance formula. This formula calculates the straight-line distance between two points in a two-dimensional Cartesian coordinate system. It is derived from the Pythagorean theorem and can be expressed as √((x2 - x1)^2 + (y2 - y1)^2).

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22.

What is the expansion of (2x – 3)³?
- A. 8x³ – 27
- B. 8x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">3 – 36x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + 54x – 27
- C. 8x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">3 + 54x – 27
- D. 8x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">3 + 36x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 – 54x –
Correct Answer

A. B. 8x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">3 – 36x<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + 54x – 27

Explanation

The given expression is a binomial raised to the power of 3. To expand it, we use the binomial theorem. The expansion of (2x – 3)3 will have four terms. The first term is obtained by cubing the first term of the binomial, which is (2x)^3 = 8x^3. The second term is obtained by multiplying the square of the first term by the second term of the binomial, which is (2x)^2 * (-3) = -36x^2. The third term is obtained by multiplying the first term of the binomial by the square of the second term, which is (2x) * (-3)^2 = 54x. The fourth term is obtained by cubing the second term of the binomial, which is (-3)^3 = -27. Therefore, the correct expansion is 8x^3 – 36x^2 + 54x – 27.

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23.

Mr. Torres has to travel going to his workplace during weekdays (Monday to Fiday). He has three ways to travel – by train, car or jeep. In how many ways can Mr. Torres report for work during the said days?
- A. 243 ways
- B. 225 ways
- C. 15 ways
- D. 3 ways
Correct Answer

A. A. 243 ways

Explanation

Mr. Torres has three options for traveling to work each day: by train, car, or jeep. Since he has to travel for five days (Monday to Friday), the total number of ways he can report for work is the product of the number of options for each day. Since each day has three options, the total number of ways is 3 * 3 * 3 * 3 * 3 = 243 ways.

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24.

What is the value of the expression C (8, 6)?
- A. 56
- B. 48
- C. 28
- D. 14
Correct Answer

A. C. 28

Explanation

The value of the expression C(8, 6) represents the number of ways to choose 6 items from a set of 8 items without considering their order. This can be calculated using the formula for combinations, which is C(n, r) = n! / (r! * (n-r)!). Plugging in the values, we get C(8, 6) = 8! / (6! * (8-6)!) = 8! / (6! * 2!) = (8 * 7) / (2 * 1) = 56 / 2 = 28. Therefore, the correct answer is C. 28.

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25.

What is the value of expression 10!/(4!7!)
- A. 90
- B. 60
- C. 40
- D. 30
Correct Answer

A. D. 30

Explanation

The value of the expression 10!/(4!7!) can be calculated by simplifying the factorials. 10! means 10 factorial, which is the product of all positive integers from 1 to 10. Similarly, 4! means 4 factorial, which is the product of all positive integers from 1 to 4, and 7! means 7 factorial, which is the product of all positive integers from 1 to 7. By dividing 10! by the product of 4! and 7!, we can simplify the expression to (10*9*8)/(4*3*2*1) = 720/24 = 30. Therefore, the correct answer is D. 30.

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26.

What is the equation of the circle whose center is at the point (3,2), and the point (9,10) is on the circle
- A. (x + 3)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + (y + 2)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 = 10
- B. (x – 3)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + (y – 2)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 = 100
- C. (x – 2)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + (y – 3)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 = 100
- D. (x – 3)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + (y – 2)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 = 100
Correct Answer

A. B. (x – 3)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 + (y – 2)<sup style="line-height:0; margin-bottom:0px; margin-left:0px; margin-right:0px; margin-top:0px; padding-bottom:0px; padding-left:0px; padding-right:0px; padding-top:0px; position:relative; top:-0.5em; vertical-align:baseline">2 = 100

Explanation

The equation of a circle with center (h,k) and radius r is given by (x-h)^2 + (y-k)^2 = r^2. In this question, the center of the circle is given as (3,2) and the point (9,10) is on the circle. To find the radius, we can use the distance formula between the center and the point on the circle. The distance between (3,2) and (9,10) is sqrt((9-3)^2 + (10-2)^2) = sqrt(36 + 64) = sqrt(100) = 10. Therefore, the equation of the circle is (x-3)^2 + (y-2)^2 = 10^2 = 100, which matches option B.

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27.

What is the value of P (8, 5)?
- A. 356
- B. 6720
- C. 56
- D. 40
Correct Answer

A. B. 6720
28.

A die is to be thrown and a card is to be drawn in a deck of cards. What is the probability that the card drawn is an ace and an even number will appear on a die?
- A. 4/13
- B. 5/156
- C. 1/13
- D. 1/26
Correct Answer

A. D. 1/26

Explanation

The probability of drawing an ace from a deck of cards is 4/52, since there are 4 aces in a deck of 52 cards. The probability of rolling an even number on a die is 3/6, since there are 3 even numbers (2, 4, and 6) out of 6 possible outcomes. To find the probability of both events occurring, we multiply the probabilities together: (4/52) * (3/6) = 12/312 = 1/26. Therefore, the probability that the card drawn is an ace and an even number appears on the die is 1/26.

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29.

There are 10 green balls, 8 white balls and 6 blue balls in a jar. What is the probability that when a ball is picked from the bag, it is a non-white ball?
- A. 1/4
- B. 2/3
- C. 7/12
- D. 1/3
Correct Answer

A. B. 2/3

Explanation

The probability of picking a non-white ball can be calculated by dividing the number of non-white balls (10 green balls + 6 blue balls = 16) by the total number of balls (10 green balls + 8 white balls + 6 blue balls = 24). Therefore, the probability is 16/24, which can be simplified to 2/3.

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30.

A committee consisting of 4 males and 3 females is to be formed. In how many ways can the committee be formed if there are 8 females and 6 males available?
- A. 840
- B. 820
- C. 780
- D. 760
Correct Answer

A. A. 840

Explanation

The committee can be formed by selecting 3 females out of 8 available females and 4 males out of 6 available males. The number of ways to select 3 females out of 8 is given by the combination formula C(8,3) = 8! / (3! * (8-3)!) = 56. Similarly, the number of ways to select 4 males out of 6 is given by the combination formula C(6,4) = 6! / (4! * (6-4)!) = 15. Therefore, the total number of ways to form the committee is 56 * 15 = 840.

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0
31.

Which of the following explains the mechanism of gc compressor?
- A. Boyle’s Law
- B. Charles Law
- C. Ideal Gas Law
- D. Combined Gas Law
Correct Answer

A. A. Boyle’s Law

Explanation

Boyle's Law explains the mechanism of the gc compressor. Boyle's Law states that at a constant temperature, the volume of a gas is inversely proportional to its pressure. In the case of a gc compressor, as the pressure increases, the volume of the gas decreases. This is achieved by decreasing the size of the gas chamber, which compresses the gas. Therefore, Boyle's Law is applicable to the mechanism of the gc compressor.

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32.

What gas law BEST explains the explosion of tthe heated aerosol container?
- A.Boyle’s Law
- B. Ideal Gas Law
- C. Avogadro’s Law
- D. Gay-Lussac’s Gas Law
Correct Answer

A. D. Gay-Lussac’s Gas Law
33.

When the volume of the gas is doubled, the temperature at constant pressure is __________.
- A. tripled
- B. doubled
- C. reduced to one half
- D. reduced to one fourth
Correct Answer

A. B. doubled

Explanation

When the volume of a gas is doubled at constant pressure, according to Charles's Law, the temperature of the gas also doubles. Charles's Law states that the volume of a gas is directly proportional to its temperature when pressure is held constant. Therefore, if the volume is doubled, the temperature will also double.

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34.

What happens to the pressure of the gas as its volume decreases at constant temperature?
- A. decreases
- B. increases
- C. stays the same
- D. remains unpredictable
Correct Answer

A. B. increases

Explanation

As the volume of a gas decreases at constant temperature, the particles of the gas are forced into a smaller space. This results in more frequent collisions between the particles and the walls of the container, leading to an increase in pressure. Therefore, the correct answer is B. increases.

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35.

Which of the following phenomena does not involve the application of gas pressure?
- A. burning fuels
- B. falling leaves
- C. vulcanizing tire
- D. rising hot air balloons
Correct Answer

A. B. falling leaves

Explanation

Falling leaves do not involve the application of gas pressure. Burning fuels involve the release of gases that create pressure, vulcanizing tires involves the use of gas pressure to shape and mold the tires, and rising hot air balloons involve the use of gas pressure to lift the balloon off the ground. However, falling leaves are a result of gravity and do not require the application of gas pressure.

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36.

Last summer vacation, the Cruz family decided to go to Pagudpod, Ilocos Norte to have beach party. On their way to Ilocos, all of them were surprised when the tire suddenly exploded. What could be the possible explanation for the blown out tire during a long summer drive?
- A. Volume of gases
- B. High temperature
- C. Increased mass of the gases
- D. Increased amount of the gases inside
Correct Answer

A. B. High temperature

Explanation

The blown out tire during a long summer drive could be due to high temperature. The heat from the summer weather can cause the air inside the tire to expand, leading to increased pressure. If the pressure exceeds the tire's maximum capacity, it can result in a blowout.

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37.

A balloon with a volume of 200mL at 30⁰C is submerged in hot water to obtain a temperature of 50⁰C. What will be the new volume of the balloon, provided that the pressure remains the same?
- A. 150 mL
- B. 200 mL
- C. 213 mL
- D. 280 mL
Correct Answer

A. C. 213 mL

Explanation

When a balloon is submerged in hot water, the temperature of the air inside the balloon increases. According to Charles's Law, the volume of a gas is directly proportional to its temperature, assuming the pressure remains constant. Therefore, as the temperature increases from 30°C to 50°C, the volume of the balloon will also increase. Since the initial volume is 200mL, the new volume will be greater than 200mL. Among the given options, the only volume greater than 200mL is 213mL, so the correct answer is C. 213 mL.

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38.

A chemical reaction is a process in which _______.
- A. all reactant change state
- B. products change into reactants
- C. the law of conservation of mass applies
- D. A, B, AND C
Correct Answer

A. C. the law of conservation of mass applies

Explanation

A chemical reaction is a process in which the law of conservation of mass applies. This means that the total mass of the reactants before the reaction is equal to the total mass of the products after the reaction. This principle states that matter cannot be created or destroyed in a chemical reaction, only rearranged. Therefore, the mass of the reactants must be equal to the mass of the products.

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39.

What determines an atom’s ability to undergo chemical reactions?
- A. Protons
- B. Neutrons
- C. Innermost electrons
- D. Outermost electrons
Correct Answer

A. D. Outermost electrons

Explanation

The outermost electrons of an atom, also known as valence electrons, determine its ability to undergo chemical reactions. These electrons are involved in the formation of chemical bonds with other atoms, which determines the atom's reactivity. The number and arrangement of outermost electrons determine the atom's valence, which determines its chemical properties and how it will interact with other atoms.

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40.

How is a chemical equation balanced?
- A. Adding elements
- B. Erasing elements
- C. Adding coefficients
- D. Changing subscripts
Correct Answer

A. C. Adding coefficients

Explanation

A chemical equation is balanced by adding coefficients to the reactants and products. Coefficients are whole numbers that are placed in front of the chemical formulas to indicate the number of molecules or atoms involved in the reaction. By adjusting the coefficients, the number of atoms of each element on both sides of the equation can be made equal. This ensures that the law of conservation of mass is satisfied, as the total mass of the reactants is equal to the total mass of the products.

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41.

In which specialized organelle of cell the process of converting food molecule to harness energy happens?
- A. Chlorophyll
- B. Chloroplast
- C. Mitochondria
- D. Vacuole
Correct Answer

A. B. Chloroplast

Explanation

Chloroplasts are specialized organelles found in plant cells where the process of converting food molecules to harness energy occurs. They contain a pigment called chlorophyll which absorbs sunlight and uses it to convert carbon dioxide and water into glucose through photosynthesis. This glucose is then used by the cell to produce ATP, the main source of energy for cellular processes. Therefore, chloroplasts play a crucial role in energy production in plant cells.

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42.

Which part of specialized organelle of a plant cell light-dependent stage of photosynthesis occurs?
- A. grana
- B. lamellae
- C. stroma
- D. thylakoid
Correct Answer

A. D. thylakoid

Explanation

In the light-dependent stage of photosynthesis, the conversion of light energy into chemical energy takes place. This process occurs in the specialized organelle called the chloroplast. Within the chloroplast, the thylakoid is the specific site where the light-dependent reactions occur. Thylakoids are membrane-bound structures that contain chlorophyll and other pigments necessary for capturing light energy. They are arranged in stacks called grana, which are interconnected by lamellae. The stroma, on the other hand, is the fluid-filled space surrounding the thylakoids where the light-independent reactions of photosynthesis occur. Therefore, the correct answer is D. thylakoid.

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43.

Which organisms convert solar energy into chemical energy stored in sugar molecules?
- A. bacteria
- B. photosynthetic
- C. microorganism
- D. light-independent
Correct Answer

A. B. photosynthetic

Explanation

Photosynthetic organisms, such as plants and algae, have the ability to convert solar energy into chemical energy stored in sugar molecules through the process of photosynthesis. During photosynthesis, these organisms use sunlight, water, and carbon dioxide to produce glucose and oxygen. The chlorophyll pigment in their cells captures the energy from sunlight and converts it into chemical energy, which is stored in the form of glucose. This process is essential for the survival of these organisms and plays a crucial role in the Earth's ecosystem by producing oxygen and serving as a source of energy for other organisms.

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44.

How many molecules of ATP in glycolysis was released from breaking down of glucose into pyruvate?
- A. 2
- B. 4
- C. 6
- D. 8
Correct Answer

A. A. 2

Explanation

During glycolysis, one molecule of glucose is broken down into two molecules of pyruvate. In this process, a net of two molecules of ATP is produced. Therefore, the correct answer is A. 2.

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45.

What is the total net energy production from aerobic pathway of obtaining energy?
- A. 32
- B. 34
- C. 36
- D. 38
Correct Answer

A. C. 36

Explanation

The total net energy production from the aerobic pathway of obtaining energy is 36. This means that through aerobic respiration, a total of 36 units of energy are produced.

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46.

Which characteristics of organisms deals with the maintenance of the body’s internal environment?
- A. Adaptability
- B. Evolution
- C. Homeostasis
- D. Irritability
Correct Answer

A. C. Homeostasis

Explanation

Homeostasis is the characteristic of organisms that deals with the maintenance of the body's internal environment. It refers to the ability of an organism to regulate its internal conditions, such as temperature, pH levels, and nutrient balance, in order to maintain a stable and optimal internal environment for proper functioning. This process involves various physiological mechanisms that work together to keep the body's internal conditions within a narrow range, despite external changes or fluctuations. Homeostasis is crucial for the survival and normal functioning of organisms.

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47.

Which process genetic information is passed on from one generation to another as organisms produce offspring that resembles their parents?
- A. Evolution
- B. Homeostasis
- C. Heredity
- D. Reproduction
Correct Answer

A. D. Reproduction

Explanation

Reproduction is the correct answer because it is the process through which genetic information is passed on from one generation to another. Organisms produce offspring that resemble their parents through the process of reproduction, ensuring the continuation of genetic traits and characteristics.

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48.

Which characteristics of organisms deals with the molecular structure of DNA accounts for its ability to be used as a genetic material?
- A. Heredity
- B. Irritability
- C. Evolution
- D. Reproduction
Correct Answer

A. A. Heredity

Explanation

The correct answer is A. Heredity. Heredity refers to the passing of traits from parents to offspring, and DNA is responsible for carrying the genetic information that determines these traits. DNA's molecular structure, with its unique sequence of nucleotides, allows it to be replicated and passed on accurately during cell division and reproduction. This ensures that genetic information is inherited and maintained across generations, making DNA a crucial molecule for heredity.

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49.

Which limiting factor affects an area that dries up due to drought, a lot of animals and plants which could result to death or migration?
- A. atmosphere
- B. shelter
- C. water
- D. food
Correct Answer

A. D. food

Explanation

During a drought, the lack of water leads to the drying up of an area, which in turn affects the availability of food for animals and plants. This scarcity of food can result in death or migration of the organisms. Therefore, the limiting factor that affects an area that dries up due to drought is the availability of food.

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Quiz Edited by
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May 08, 2019

Quiz Created by
Stem Knhs

Knhs STEM Qualifying Exam 2019

If the set of numbers 3, -12, 48, -192 form a geometric sequence, what is the common ratio between any two consecutive terms

Quiz Preview

What is the next term in the arithmetic sequence: 2, 13/4, 9/2, 23/4,.

Which of the following is NOT an example of a harmonic sequence?

What is the sum of all even integers from 21 to 50?

What quotient shall be obtained when (x+9) divides (x2 – 81)?

What is the 14th term of a geometric sequence if the 4th term is 800 and the 10th term is 25/2?

What is the remainder if the expression ( 5b2+ 15b – 35) is divided by (b + 5)?

Which of the following is a factor of (3a + 1)?

What is the value of K if the expression (- 5x3 + 4x2 – 3x + K) is divided by (x-1), and obtains a remainder of 10?

Jace will evaluate a 7th degree polynomial in m, whose value is 5 through synthetic division. How many coefficients of m shall be written in the first row of the synthetic division procedure?

What is the value of P(-2) in the expression: P(x) = 7x4 – 5x3 + 2x2 – 3?

Which of the following polynomial equation with roots -1, 1 and 4?

What are the roots of the quadratic equation b2 – 5b – 36 = 0?

A square with a side of 12 cm and a rectangle with a width of 8 cm have the same area. What is the length of the rectangle?

In square FATE, the measure of angle F is 4x + 30. What is the value of x?

What is the sum of the first 8 terms of arithmetic sequence whose first term is 37 and the common difference is -4?

The polynomial function P(x) = xn is true when,

What is the leading term in a polynomial function P(x) = 5 + 7x4 – 3x + 2x5?

The computation for profit in a textile store is presented by the mathematical model P(x) = 3x2 + 6x – 120,000 where x is the number of meters being sold. What is the computed profit if the number of meters being sold is 250?

Which of the following function will cross the x-axis thrice?

Which of the following mathematical models is used to determine the distance between two points whose coordinates are (x1, y1) and (x2, y2)?

What is the expansion of (2x – 3)3?

Mr. Torres has to travel going to his workplace during weekdays (Monday to Fiday). He has three ways to travel – by train, car or jeep. In how many ways can Mr. Torres report for work during the said days?

What is the value of the expression C (8, 6)?

What is the value of expression 10!/(4!7!)

What is the equation of the circle whose center is at the point (3,2), and the point (9,10) is on the circle

What is the value of P (8, 5)?

A die is to be thrown and a card is to be drawn in a deck of cards. What is the probability that the card drawn is an ace and an even number will appear on a die?

There are 10 green balls, 8 white balls and 6 blue balls in a jar. What is the probability that when a ball is picked from the bag, it is a non-white ball?

A committee consisting of 4 males and 3 females is to be formed. In how many ways can the committee be formed if there are 8 females and 6 males available?

Which of the following explains the mechanism of gc compressor?

What gas law BEST explains the explosion of tthe heated aerosol container?

When the volume of the gas is doubled, the temperature at constant pressure is __________.

What happens to the pressure of the gas as its volume decreases at constant temperature?

Which of the following phenomena does not involve the application of gas pressure?

Last summer vacation, the Cruz family decided to go to Pagudpod, Ilocos Norte to have beach party. On their way to Ilocos, all of them were surprised when the tire suddenly exploded. What could be the possible explanation for the blown out tire during a long summer drive?

A balloon with a volume of 200mL at 300C is submerged in hot water to obtain a temperature of 500C. What will be the new volume of the balloon, provided that the pressure remains the same?

A chemical reaction is a process in which _______.

What determines an atom’s ability to undergo chemical reactions?

How is a chemical equation balanced?

In which specialized organelle of cell the process of converting food molecule to harness energy happens?

Which part of specialized organelle of a plant cell light-dependent stage of photosynthesis occurs?

Which organisms convert solar energy into chemical energy stored in sugar molecules?

How many molecules of ATP in glycolysis was released from breaking down of glucose into pyruvate?

What is the total net energy production from aerobic pathway of obtaining energy?

Which characteristics of organisms deals with the maintenance of the body’s internal environment?

Which process genetic information is passed on from one generation to another as organisms produce offspring that resembles their parents?

Which characteristics of organisms deals with the molecular structure of DNA accounts for its ability to be used as a genetic material?

Which limiting factor affects an area that dries up due to drought, a lot of animals and plants which could result to death or migration?

What quotient shall be obtained when (x+9) divides (x² – 81)?

What is the 14^th term of a geometric sequence if the 4th term is 800 and the 10^th term is 25/2?

What is the remainder if the expression ( 5b²+ 15b – 35) is divided by (b + 5)?

What is the value of K if the expression (- 5x³ + 4x² – 3x + K) is divided by (x-1), and obtains a remainder of 10?

Jace will evaluate a 7^th degree polynomial in m, whose value is 5 through synthetic division. How many coefficients of m shall be written in the first row of the synthetic division procedure?

What is the value of P(-2) in the expression: P(x) = 7x⁴ – 5x³ + 2x² – 3?

What are the roots of the quadratic equation b² – 5b – 36 = 0?

The polynomial function P(x) = xⁿ is true when,

What is the leading term in a polynomial function P(x) = 5 + 7x⁴ – 3x + 2x⁵?

The computation for profit in a textile store is presented by the mathematical model P(x) = 3x² + 6x – 120,000 where x is the number of meters being sold. What is the computed profit if the number of meters being sold is 250?

Which of the following mathematical models is used to determine the distance between two points whose coordinates are (x₁, y₁) and (x₂, y₂)?

What is the expansion of (2x – 3)³?

A balloon with a volume of 200mL at 30⁰C is submerged in hot water to obtain a temperature of 50⁰C. What will be the new volume of the balloon, provided that the pressure remains the same?