Lesson 1 - Laws of Motion | 10th Science Online Test ( MCQ )

#1. Inertia of a body depends on:

(a) weight of the object

(b) acceleration due to gravity of the planet

(c) mass of the object

(d) both (a) & (b)

#2. Impulse is equals to ______ .

(a) rate of change of momentum

(b) rate of force and time

(c) change of momentum

(d) rate of change of mass

#3. Newton’s III law is applicable:

(a) for a body is at rest

(b) for a body in motion

(c) both (a) & (b)

(d) only for bodies with equal masses

#4. Plotting a graph for momentum on the X-axis and time on Y-axis. Slope of momentum – time graph gives _____

(a) Impulsive force

(b) Acceleration

(c) Force

(d) Rate of force.

#5. In which of the following sport the turning effect of force is used?

(a) swimming

(b) tennis

(c) cycling

(d) hockey

#6. The unit of ‘g’ is ms-2. It can be also expressed as:

(a) cm s-2

(b) N kg-1

(c) N m2kg-1

(d) cm2s-2

#7. One kilogram force equals to _____ .

(a) 9.8 dyne

(b) 9.8 × 104 N

(c) 98 × 104 dyne

(d) 980 dyne.

#8. The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be ….. kg.

(a) 4 M

(b) 2 M

(c) M/4

(d) M

#9. To project the rockets which of the following principle(s) is / (are) required?

(a) Newton’s third law of motion

(b) Newton’s law of gravitation

(c) law of conservation of linear momentum

(d) both a and c.

#10. If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will:

(a) decrease by 50%

(b) increase by 50%

(c) decrease by 25%

(d) increase by 300%

#11. To produce a displacement …….. is required.

force

inertia

negative, positive

Accelerator

Weight = m × g = 100 × 9.8 = 980 N

#12. Passengers lean forward when the sudden brake is applied in a moving vehicle. This can be explained by ……….

Accelerator

force

Weight = m × g = 100 × 9.8 = 980 N

inertia

#13. By convention, the clockwise moments are taken as ……… and the anticlockwise moments are taken as ……….

Accelerator

inertia

negative, positive

force

#14. …….. is used to change the speed of the car.

negative, positive

Accelerator

Weight = m × g = 100 × 9.8 = 980 N

inertia

#15. A man of mass 100 kg has a weight of …….. at the surface of the Earth

Accelerator

Weight = m × g = 100 × 9.8 = 980 N

negative, positive

inertia

#16. The linear momentum of a system of particles is always conserved.

True

False

#17. Apparent weight of a person is always equal to his actual weight.

True

False

#18. Weight of a body is greater at the equator and less at the polar region

False

True

#19. Turning a nut with a spanner having a short handle is so easy than one with a long handle.

True

False

#20. There is no gravity in the orbiting space station around the Earth. So the astronauts feel weightlessness.

True

False

#21. Assertion: The sum of the clockwise moments is equal to the sum of the anticlockwise moments.
Reason: The principle of conservation of momentum is valid if the external force on the system is zero.

(a) If both the assertion and the reason are true and the reason is the correct explanation of assertion.

(b) If both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.

(c) Assertion is true, but the reason is false.

(d) Assertion is false, but the reason is true.

#22. 2. Assertion: The value of ‘g’ decreases as height and depth increases from the surface of the Earth.
Reason: ‘g’ depends on the mass of the object and the Earth

(a) If both the assertion and the reason are true and the reason is the correct explanation of assertion.

(b) If both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.

(c) Assertion is true, but the reason is false.

(d) Assertion is false, but the reason is true.

Lesson 1 – Laws of Motion | 10th Science Online Test ( MCQ )