May, 2022Flame Institute

If radius of the earth contracts 2% and its mass remains the same, then weight of the body at the earth surface

(a) Will decrease (b) Will increase (c) Will remain the same (d) None of these Answer: b (13)

If the radius of the earth shrinks by 1.5% (mass remaining same), then the value of acceleration due to gravity changes by

(a) 1% (b) 2% (c) 3% (d) 4% Answer: c (5)

Where will it be profitable to purchase 1 kilogram sugar

(a) At poles (b) At equator (c) At 45° latitude (d) At 40° latitude Answer: b (8)

24. Assertion : A body subjected to three concurrent forces cannot be in equilibrium. Reason : If large number of concurrent forces acting on the same point, then the point will be in equilibrium, if sum of all the forces is equal to zero.

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

25. Assertion : Impulse and momentum have different dimensions. Reason : From Newton’s second law of motion, impulse is equal to change in momentum.

23. Assertion : A table cloth can be pulled from a table without dislodging the dishes. Reason : To every action there is an equal and opposite reaction.

22. Assertion : A reference frame attached to earth is an inertial frame of reference. Reason : The reference frame which has zero acceleration is called a non inertial frame of reference.

21. Assertion : Newton’s third law of motion is applicable only when bodies are in motion. Reason : Newton’s third law applies to all types of forces, e.g. gravitational, electric or magnetic forces etc.

Let g be the acceleration due to gravity at earth’s surface and K be the rotational kinetic energy of the earth. Suppose the earth’s radius decreases by 2% keeping all other quantities same, then

(a) g decreases by 2% and K decreases by 4% (b) g decreases by 4% and K increases by 2% (c) g increases by 4% and K increases by 4% (d) g decreases by 4% and K increases by 4% …

Radius of earth is around 6000 km. The weight of body at height of 6000 km from earth surface becomes

(a) Half (b) One-fourth (c) One third (d) No change Answer: b (10)

A satellite revolves around the earth in an elliptical orbit. Its speed

(a) Is the same at all points in the orbit (b) Is greatest when it is closest to the earth (c) Is greatest when it is farthest from the earth (d) Goes on increasing or decreasing continuously depending upon the …

Alginic acid is obtained from

(a) Red algae (b) Green algae (c) Diatoms (d) Brown algae Ans. d (9)

20. Assertion : Linear momentum of a body changes even when it is moving uniformly in a circle. Reason : In uniform circular motion velocity remain constant.

A small satellite is revolving near earth’s surface. Its orbital velocity will be nearly

(a) 8 km/sec (b) 11.2 km/sec (c) 4 km/sec (d) 6 km/sec Answer: a (11)

19. Assertion : The acceleration produced by a force in the motion of a body depends only upon its mass. Reason : Larger is the mass of the body, lesser will be the acceleration produced.

A geostationary satellite

(a) Revolves about the polar axis (b) Has a time period less than that of the near earth satellite (c) Moves faster than a near earth satellite (d) Is stationary in the space Answer: a (12)