NEET Physics: Questions 161 - 164 of 2098

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Question number: 161

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A projectile can have the same range R for two angles of projections. If t1 and t2 be the times of flight in two cases, then choose the incorrect relations –

Choices

Choice (4) Response

a.

t 1 t 2 R2

b.

t 1 t 2 1R t 1 t 2 R

c.

t 1 t 2 1R

d.

t 1 t 2 1R2

Question number: 162

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The angular displacement of a particle is given by θ=ω0t+12αt2 where co0 and a are constant and ∞0 = 1 rad/sec, α = 1.5 rad/sec2. The angular velocity at time, t = 2 sec will be (in rad/sec) –

Choices

Choice (4) Response

a.

5

b.

1

c.

3

d.

4

Question number: 163

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

Assertion (Ꭺ)

A man projects a stone with speed u at some angle. He again projects a stone with same speed such that time of flight now is different. The horizontal ranges in both the cases may be same. (Neglect air friction)

Reason (Ꭱ)

The horizontal range is same for two projectiles projected with same speed if one is projected at an angle 6 with the horizontal and other is projected at

an angle (90° - 6) with the horizontal. (Neglect air friction)

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

Question number: 164

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A ball ‘A’ is projected from origin with an initial velocity v0 = 700 cm/sec in a direction 37° above the horizontal as shown in fig Another ball ‘B’ 300 cm from origin on a line 37° above the horizontal is released from rest at the instant A starts. How far will B have fallen when it is hit by A?

Choices

Choice (4) Response

a.

900 cm

b.

0.9 cm

c.

90 cm

d.

9 cm

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