MAHARASHTRA

XII (12) HSC

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### Science 10th Standard, Tamil Nadu. Chapter No. 1. Laws of motion

1. Laws of motion

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 and b.

2. Impulse is equal 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 and b
d. only for bodies with equal masses

4. Plotting a graph for momentum on the X - axis and time 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 of effect of force is used

a. swimming
b. tennis
c. cycling
d. hockey

6. The unit of 'g' is m s-2. It can be also expressed as

a. cm s-1
b. N kg-1
c. N m2 kg-1
d. cm2 s-2

7. One kilogram force equals to

a. 9.8 dyne
b. 9.8 x 104 N
c. 98 x 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. 4M
b. 2M
c. M/4
d. M

9. 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%

10. 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.

II. Fill in the blanks.

1. To produce a displacement _______________ is required. Ans. Force.

2. Passengers lean forward when sudden brake is applied in a moving vehicle. This can be explained by _______________ Ans. Inertia

3. By convention, the clockwise moments are taken as _________ and the anticlockwise moments are taken as _______________. Ans. negative, positive.

4. _______________ is used to change the speed of the car.  Ans. Torque

5. A man of mass 100 kg has a weight of _________ at the surface of the Earth. Ans. 980 N.

III.State whether the following statements are true or false. Correct the statement if it is false.

1. The linear momentum of a system of particles is always conserved.
2. Apparent weight of a person is always equal to his actual weight.
3. Weight of a body is greater at the equator and less at the polar region.
4. Turning a nut with a spanner having a short handle is so easy than one with a long handle.
5. There is no gravity in the orbiting space station around the Earth. So the astronauts feel weightlessness.

IV. Match the following.

 Column I Column II 1. Newton's I law a. Propulsion of a rocket. 2. Newton's II law b. Stable equilibrium of a body. 3. Newton's III law c. Law of force 4. Law of conservation of linear momentum d. Flying nature of bird

V. Assertion and Reasoning.

1. 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.

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.

3. If a 5N and a 15N forces are acting opposite to one another. Find the resultant force and the direction of action of the resultant force.

4. Differentiate between mass and weight.

5. Define moment of a couple.

6. State the principle of moments.

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