NEET Physics: Questions 184 - 186 of 2098

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Question number: 184

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

Savita throws a ball horizontally with a velocity of 8 m/s from the top of her building. The ball strikes to her brother Sudhir playing at 12 m away from the building. What is the height of the building?

Choices

Choice (4) Response

a.

7m

b.

8m

c.

10m

d.

11m

Question number: 185

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

Choose the correct options

(1) A ball is dropped from the window of a moving train on horizontal rails, the path followed by the ball as observed by the observer on the ground is parabolic path.

(2) If T be the total time of flight of a current of water and H be the maximum height attained by it from the point of projection, then H/T will be (1/4) u sin 0

(u = projection velocity and 0 = projection angle)

(3) A hunter aims his gun and fires a bullet directly at a monkey on a tree. At the instant bullet leaves the gun, monkey drops, the bullet misses to hit the monkey.

(4) If a baseball player can throw a ball at maximum distance = d over a ground, the maximum vertical height to which he can throw it, will be d

(Ball have same initial speed in each case)

Choices

Choice (4) Response

a.

2 and 4

b.

1 and 2

c.

1 and 3

d.

1, 2 and 3

Question number: 186

» Laws of Motion » Centripetal Force

MCQ▾

Question

An electron is moving in a circular orbit of radius 5.3 x 10 -11 metre around the atomic nucleus at a rate of 6.6 x 1015 revolutions per second. The centripetal force acting on the electron will be -

(The mass of the electron is 9.1 x 10 - 31kg)

Choices

Choice (4) Response

a.

4.15×108N

b.

3.8×108N

c.

2.07×108N

d.

8.3×108N

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