KVPY Stream-SA (Class 11) Physics: Questions 197 - 200 of 252

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Question number: 197

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

Question

At the moment t = 0, a particle leaves the origin and moves in positive direction of x – axis. Its velocity varies with time as,

v=v0(1tt0)

Where v0 is the initial velocity vector whose modulus equals v0=10cms , t0=5sec . The moments of time when the particle is at the distance + 10 cm is –

Choices

Choice (4) Response

a.

1±15

b.

5±10

c.

5±15

d.

1±10

Question number: 198

» Gravitation » Energy

MCQ▾

Question

Two starts each of 1 solar mass (2×1030kg) are approaching each other for a head-on collision. When they are at a distance of 3 ⨯ 107 km, their speeds are negligible. The speed with which they collide is –

(The radius of each star is 105 km, assume the stars to remain undistorted until they collide. G=6.67×1011N×m2kg2 . )

Choices

Choice (4) Response

a.

2.582×109ms

b.

2.574×107ms

c.

3.82×107ms

d.

2.574×109ms

Question number: 199

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

The activity of a radioactive sample reduces to 13 of its original value in 2 hours. What will be its activity in 6 hours?

Choices

Choice (4) Response

a.

13

b.

127

c.

181

d.

19

Question number: 200

» Work, Energy and Power » Conservation of Mechanical Energy

MCQ▾

Question

The energy required to accelerate a car from rest to 12 ms-1 is E. What energy will be required to accelerate the car from 12 ms-1 to 24 ms-1?

Choices

Choice (4) Response

a.

E

b.

7E

c.

5E

d.

3E

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