CBSE Class 11 PSA Physics Sample Paper Set B

1. Centre of mass of two masses m₁ and m₂, where m₁ > m₂ is

a) Closer to m₁

b) Closer to m₂

c) Midway between m₁ and m₂

d) On a line perpendicular to line joining m₁ and m₂

2. Three objects A,B and C are projected from same point with the same initial speeds making angles 300,450 and 600 respectively with the horizontal. Which of the following statements is correct?

a) A, B and C have equal ranges

b) ranges of A and C are equal but less than that of B

c) ranges of A and C are equal but more than that of B

d) A, B and C have unequal ranges.

3. Law of conservation of linear momentum (choose incorrect option)

a) always holds good for a closed system

b) is a consequence of Newton’s third law

c) is independent of frame of reference

d) is true if kinetic energy is also conserved.

PASSAGE 1

Cyclone in meteorology refers to any low pressure area with winds spiraling inwards. Tropical cyclones form only over warm ocean waters near the equator. Cyclones are also referred to as hurricanes and typhoons

• To form a cyclone, warm, moist air over the ocean rises upward from near the surface. As this air moves up and away from the ocean surface, it leaves less air near the surface. So basically as the warm air rises, it causes an area of lower air pressure below.

• Air from surrounding areas with higher air pressure pushes in to the low pressure area. Then this new “cool” air becomes warm and moist and rises, too. And the cycle continues…