NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 153 - 158 of 2142

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Question number: 153

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A body of mass 4 kg lying on a smooth surface is attached to a string 6 m long and then whirled round in a horizontal circle making 60 revolution per minute. The centripetal acceleration will be

Choices

Choice (4) Response

a.

23.68 m/s 2

b.

236.6 m/s 2

c.

1.18 m/s 2

d.

2.368 m/s 2

Question number: 154

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The length of second’s hand in a watch is 1 cm. The change in velocity of its tip in 15 second is –

Choices

Choice (4) Response

a.

b.

c.

d.

0

Question number: 155

» Kinematics » Motion in a Plane

MCQ▾

Question

Rishabh and Bappy are playing with two different balls of masses m and 2m respectively. If Rishabh throws his ball vertically up and Bappy at an angle 0, both of them stay in our view for the same period. The heights attained by the two balls are in the ratio of

Choices

Choice (4) Response

a.

1: 1

b.

2: 1

c.

1: sec 0

d.

1: cos 9

Question number: 156

» Kinematics » Motion in a Plane

MCQ▾

Question

A body is thrown at an angle 30° to the horizontal with the velocity of 30 m/s. After 1 sec, its velocity will be (in m/s) (g = 10 m/s2)

Choices

Choice (4) Response

a.

10√7

b.

√10

c.

100√7

d.

700√10

Question number: 157

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

Using rectangular co-ordinates and the unit vectors i and j, the vector expression for the acceleration a will be (r is a position vector) -

Choices

Choice (4) Response

a.

-2r 2

b.

- 2 r

c.

d.

r 2

Question number: 158

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A ball is thrown from the top of a tower with an initial velocity of 10 m/s at an angle of 30° above the horizontal. It hits the ground at a distance of 17.3 m from the base of the tower. The height of the tower (g = 10 m/s2) will be

Choices

Choice (4) Response

a.

10m

b.

110m

c.

100m

d.

12m

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