2013 SEC 3 Physics Quiz (For Term 1)

1. An astronaut on the Moon can jump much higher than a person on Earth because

He/she weighs less on the Moon than on Earth.

His/her mass is less on the Moon than on Earth.

There is little or no atmosphere on the Moon.

The correct answer is that an astronaut on the Moon can jump much higher than a person on Earth because he/she weighs less on the Moon than on Earth. This is due to the difference in gravitational pull between the Moon and Earth. The Moon has only about 1/6th the gravity of Earth, so objects and people on the Moon weigh much less compared to their weight on Earth. As a result, the astronaut's reduced weight allows for a higher jump on the Moon.

Explanation

The correct answer is that an astronaut on the Moon can jump much higher than a person on Earth because he/she weighs less on the Moon than on Earth. This is due to the difference in gravitational pull between the Moon and Earth. The Moon has only about 1/6th the gravity of Earth, so objects and people on the Moon weigh much less compared to their weight on Earth. As a result, the astronaut's reduced weight allows for a higher jump on the Moon.

2.

A

B

C

D

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3.

A

B

C

D

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4.

A

B

C

D

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5.

A

B

C

D

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6.

1

2

3

4

5

6

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7.

OP

OQ

OR

OS

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8. A constant horizontal force is applied to a body initially at rest on a smooth horizontal table. Which of the following quantities will not change during the application of the force?

The displacement of the body.

The velocity of the body.

The acceleration of the body.

The kinetic energy of the body.

The acceleration of the body will not change during the application of the force. This is because acceleration is directly proportional to the force applied to an object, according to Newton's second law of motion. As long as the force remains constant, the acceleration will also remain constant. The displacement, velocity, and kinetic energy of the body, on the other hand, will change as the force is applied.

Explanation

The acceleration of the body will not change during the application of the force. This is because acceleration is directly proportional to the force applied to an object, according to Newton's second law of motion. As long as the force remains constant, the acceleration will also remain constant. The displacement, velocity, and kinetic energy of the body, on the other hand, will change as the force is applied.

9.

1

2

3

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10. What does each division on the thimble scale of a micrometer screw gauge represent?

0.001 mm

0.01 mm

0.01 cm

0.1 cm

Each division on the thimble scale of a micrometer screw gauge represents a measurement of 0.01 mm.

Explanation

Each division on the thimble scale of a micrometer screw gauge represents a measurement of 0.01 mm.

11. Match the following forces to their respective descriptions :

The gravitational pull on an object

The pull by a stretched spring or rope

The pull which opposes the motion of an object

Submit

12.

A

B

C

D

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13.

10.0 km

12.5 km

15.0 km

17.5 km

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14.

A

B

C

D

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15.

2 N

10 N

12 N

20 N

22 N

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16.

A

B

C

D

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17. What does each division on the vernier scale of a vernier calipers represent?

0.01 mm

0.1 mm

0.1 cm

1 cm

Each division on the vernier scale of a vernier calipers represents a measurement of 0.1 mm. This means that each small division on the scale corresponds to a difference of 0.1 mm in the measurement being taken. The vernier scale is used to provide a more precise measurement than what can be obtained from the main scale alone, allowing for measurements to be taken to the nearest 0.1 mm.

Explanation

Each division on the vernier scale of a vernier calipers represents a measurement of 0.1 mm. This means that each small division on the scale corresponds to a difference of 0.1 mm in the measurement being taken. The vernier scale is used to provide a more precise measurement than what can be obtained from the main scale alone, allowing for measurements to be taken to the nearest 0.1 mm.

18.

1

2

3

4

5

6

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19. The normal force acting on a body is always equal (in magnitude) to its weight.

True

False

The normal force acting on a body is not always equal to its weight. The normal force is the force exerted by a surface to support the weight of an object resting on it. It is always equal in magnitude but opposite in direction to the force exerted by the object on the surface. The weight of an object, on the other hand, is the force exerted by gravity on the object and is equal to the mass of the object multiplied by the acceleration due to gravity. Therefore, the normal force and weight can be equal only when the object is in equilibrium and on a horizontal surface.

Explanation

The normal force acting on a body is not always equal to its weight. The normal force is the force exerted by a surface to support the weight of an object resting on it. It is always equal in magnitude but opposite in direction to the force exerted by the object on the surface. The weight of an object, on the other hand, is the force exerted by gravity on the object and is equal to the mass of the object multiplied by the acceleration due to gravity. Therefore, the normal force and weight can be equal only when the object is in equilibrium and on a horizontal surface.