NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 388 - 391 of 2184

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Passage

Pseudo force is an imaginary force which is recognized only by a non-inertial observer to explain the physical situation according to newton’s laws. Magnitude of pseudo force F is equal to the product of the mass m of the object and the acceleration a of the frame of reference. The direction of the force is opposite to the direction of acceleration, F =-ma

Question number: 388 (2 of 3 Based on Passage) Show Passage

» Kinematics » Uniform and Non-Uniform Motion

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Question

A body is suspended by a string from the ceiling of an elevator. It is observed that the tension in the string is doubled when the elevator is accelerated. The acceleration will be -

Choices

Choice (4) Response

a.

9.8 m/s 2

b.

4.9 m/s 2

c.

2.45 m/s 2

d.

19.6 m/s 2

Question number: 389 (3 of 3 Based on Passage) Show Passage

» Kinematics » Uniform and Non-Uniform Motion

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Question

A 25 kg lift is supported by a cable. The acceleration of the lift when the tension in the cable is 175 N, will be –

Choices

Choice (4) Response

a.

16.8 m/s 2

b.

14 m/s 2

c.

2.8 m/s 2

d.

- 9.8 m/s 2

Question number: 390

» Kinematics » Average Speed and Instantaneous Velocity

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Question

A car of 1000 kg moving with a velocity of 18 km/hr is stopped by the brake force of 1000 N. The distance covered by it before coming to rest is –

Choices

Choice (4) Response

a.

12.5 m

b.

144 m

c.

1 m

d.

162 m

Question number: 391

» Laws of Motion » Force and Inertia

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Question

Choose the correct options

(1) A reference frame in which Newton’s first law is valid is’ called an inertial reference frame.

(2) Frame moving at constant velocity relative to a known inertial frame is also an inertial frame.

(3) Ideally, no inertial frame exists in the universe for practical purpose, a frame of reference may be considered as inertial if its acceleration is negligible with respect to the acceleration of the object to be observed.

(4) To measure the acceleration of a falling apple, earth cannot be considered as an inertial frame.

Select the correct answers and mark it according to the following

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1,2 and 3 are correct