Kinematics-Relative Velocity (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics): Questions 1 - 3 of 8

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Question number: 1

» Kinematics » Relative Velocity

Appeared in Year: 2011

MCQ▾

Question

A girl standing at point P on a beach wishes to reach a point Q in the sea as quickly as possible. She can run at 6 km h –1 on the beach and swim at 4 km h –1 in the sea. She should take the path,

Four different paths from P to Q

Four Different Paths From P to Q

Figure shows four different paths for reaching P to Q.

Choices

Choice (4) Response

a.

PCQ

b.

PDQ

c.

PAQ

d.

PBQ

Question number: 2

» Kinematics » Relative Velocity

Appeared in Year: 2013

MCQ▾

Question

Two stones of mass m1 and m2 (such that m1 > m2) are dropped Δt time apart from the same height towards the ground. At a later time t the difference in their speed is ΔV and their mutual separation is ΔS. While both stones are in flight,

Choices

Choice (4) Response

a.

ΔV and ΔS increase with time

b.

ΔV remains constant with time and ΔS increases with time

c.

ΔV remains constant with time and ΔS decreases with time

d.

ΔV decreases with time and ΔS increases with time

Question number: 3

» Kinematics » Relative Velocity

Appeared in Year: 2013

MCQ▾

Question

Two skaters P and Q are skating towards each other. Skater P throws a ball towards Q every 5 s such that it always leaves her hand with speed 2 ms-1 with respect to the ground. Consider two cases:

(I) P runs with speed 1 ms-1 towards Q while Q remains stationary

(II) Q runs with speed 1 ms-1 towards P while P remains stationary.

Note that irrespective of speed of P, ball always leaves P’s hand with speed 2 ms-1 with respect to the ground. Ignore gravity. Balls will be received by Q.

Choices

Choice (4) Response

a.

One every 2.5 s in case (I) and one every 2.5 s in case (II)

b.

One every 2 s in case (I) and one every 4 s in case (II)

c.

One every 3.3 s in case (I) and one every 2.5 s in case (II)

d.

One every 2.5 s in case (I) and one every 3.3 s in case (II)

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