NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 159 - 163 of 2142

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Question number: 159

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

The angular velocity of a particle is given by co = 1.51 - 3t 2 + 2, the time when its angular acceleration decreases to be zero will be -

Choices

Choice (4) Response

a.

0.25 sec

b.

25 sec

c.

1.2 sec

d.

12 sec

Question number: 160

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The vertical section of a road over a canal bridge in the direction of its length is in the form of circle of radius 8.9 meter. Find the greatest speed at which the car can cross this bridge without losing contact with the road at its highest point, the center of gravity of the car being at a height h = 1.1 meter from the ground. (Take g = 10 m/sec2)

Choices

Choice (4) Response

a.

7 m/s

b.

10 m/s

c.

5 m/s

d.

13 m/s

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

b.

t 1 t 2 t 1 t 2

c.

t 1 t 2

d.

t 1 t 2

Question number: 162

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The angular displacement of a particle is given by 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

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