Kinematics (NEET Physics): Questions 173 - 178 of 233

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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: 173 (1 of 2 Based on Passage) Show Passage

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

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: 174 (2 of 2 Based on Passage) Show Passage

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

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.

- 9.8 m/s 2

b.

2.8 m/s 2

c.

14 m/s 2

d.

16.8 m/s 2

Question number: 175

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

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: 176

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A body of mass 20 kg moving with a velocity of 3 m/s, rebounds on a wall with same velocity. The impulse on the body is -

Choices

Choice (4) Response

a.

60 Ns

b.

120 Ns

c.

30 Ns

d.

180 Ns

Question number: 177

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A ship is steaming towards east at a speed of 12 ms -1. A woman runs across the deck at a speed of 5 ms -1 in the direction at right angles to the direction of motion of the ship i. e. towards north. What is the velocity of the woman relative to sea?

Choices

Choice (4) Response

a.

12 m/s

b.

5 m/s

c.

13 m/s

d.

17 m/s

Question number: 178

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

Consider two children riding on the merry-go-round Child 1 sits near the edge, Child 2 sits closer to the center. Let V1 and v2 denote the linear speed of child 1 and

Child 2, respectively. Which of the following is/are wrong?

Select the correct answers and mark it according to the following codes:

(1) We cannot determine V 1 & V 2 without more information

(2) v 1 = v 2

(3) v 1 < v 2

(4) v 1 > v 2

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

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