1.
The Greek prefix "kilo" means
Correct Answer
C. 1000
Explanation
The Greek prefix "kilo" means 1000. This prefix is commonly used in the metric system to indicate a multiplication by 1000. For example, a kilogram is equal to 1000 grams and a kilometer is equal to 1000 meters. The prefix "kilo" comes from the Greek word "khilioi" which means thousand.
2.
The basic unit of mass in the metric system is
Correct Answer
C. Gram
Explanation
The basic unit of mass in the metric system is the gram. The gram is a unit of measurement for mass and is used to quantify the amount of matter in an object. It is a smaller unit compared to the pound, which is used in the imperial system. The litre is a unit of volume, and the second is a unit of time, so they are not the correct units for measuring mass. Therefore, the correct answer is gram.
3.
If your body temperature is 37 degrees Celsius, your temperature is -
Correct Answer
C. Normal
Explanation
A body temperature of 37 degrees is considered normal. The average normal body temperature for adults is around 37 degrees Celsius or 98.6 degrees Fahrenheit. This temperature indicates that the body is functioning within the normal range and is not experiencing a fever or hypothermia.
4.
The freezing point of water is:
Correct Answer
D. All of these
Explanation
The freezing point of water can be expressed in different temperature scales:
273 Kelvin (K)
0 degrees Celsius (°C)
32 degrees Fahrenheit (°F)
Therefore, all of these options correctly represent the freezing point of water.
5.
One litre is equal to _____________centilitres.
Correct Answer
B. 100
Explanation
One litre is equal to 100 centilitres because there are 100 centilitres in one litre. This is a conversion factor commonly used to convert between these two units of volume.
6.
What is the value of n in the proportion 5/8 = n/40?
Correct Answer
C. 25
Explanation
In the given proportion 5/8 = n/40, we can cross multiply to find the value of n. Cross multiplying gives us 5 * 40 = 8 * n. Simplifying this equation gives us 200 = 8n. Dividing both sides by 8 gives us n = 25. Therefore, the value of n in the proportion is 25.
7.
A certain coin weighs about 5 grams. How many coins would weigh 2 kg?
Correct Answer
C. 400
Explanation
To find the number of coins that would weigh 2 kg, we need to convert the weight of the coins from grams to kilograms. Since 1 kg is equal to 1000 grams, we divide 2000 grams (2 kg) by 5 grams (weight of one coin). This gives us 400, which means that 400 coins would weigh 2 kg.
8.
Which of the following is not a monomial?
Correct Answer
D. 1/3xyz
Explanation
A monomial is a mathematical expression that consists of only one term. In this case, all the options given are monomials except for 1/3xyz. This is because it is a fraction and contains multiple variables (x, y, and z), making it a polynomial rather than a monomial.
9.
What is the value of -5^{4}?
Correct Answer
C. 625
10.
Thirty less than a number is written as
Correct Answer
B. N - 30
Explanation
The given expression "n - 30" represents the phrase "thirty less than a number." This means that a certain number is being subtracted by 30. Therefore, the correct answer is "n - 30".
11.
What is the solution to the quadratic equation x^2 - 5x + 6 = 0?
Correct Answer
A. X = 2 and x = 3
Explanation
To solve the quadratic equation x^2 - 5x + 6 = 0, we can factor it as (x - 2)(x - 3) = 0. Setting each factor equal to zero gives us the solutions x = 2 and x = 3.
12.
Subtracting 5mn from -12mn is
Correct Answer
A. -17mn
Explanation
To subtract -5mn from -12mn, we can think of it as adding 5mn to -12mn. Since the signs are different, we subtract the smaller absolute value from the larger absolute value and keep the sign of the larger value, which is negative. Therefore, -12mn + 5mn equals -17mn.
13.
What is x in the expression x+5 = 16?
Correct Answer
B. 11
Explanation
In the equation x + 5 = 16, the goal is to find the value of x. To isolate x, we need to subtract 5 from both sides of the equation. This will cancel out the +5 on the left side, leaving us with x = 16 - 5. Simplifying this further, we get x = 11. Therefore, the value of x in the expression is 11.
14.
Express 2.34x10^{3 }in decimal notation.
Correct Answer
C. 2340
Explanation
The correct answer is 2340. To express a number in decimal notation, we move the decimal point to the right or left based on the exponent. In this case, the exponent is 3, which means we need to move the decimal point 3 places to the right. Starting with 2.34, we move the decimal point to get 2340.
15.
In 5 +3(2) - 6, which operation should be performed first?
Correct Answer
C. Multiplication
Explanation
In the expression 5 + 3(2) - 6, the operation that should be performed first is multiplication. This is because according to the order of operations, multiplication and division should be done before addition and subtraction. In this case, the expression 3(2) represents the multiplication of 3 and 2, resulting in 6. Therefore, the multiplication should be performed first before proceeding with the addition and subtraction.