NEET Physics: Questions 63 - 67 of 2142

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Question number: 63

Assertion-Reason▾

Assertion (Ꭺ)

The acceleration of a body of mass 2 kg thrown vertically upwards is always constant.

Reason (Ꭱ)

A body of all mass group travels under constant acceleration when only gravity acts on it.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

Both Ꭺ and Ꭱ are false

Question number: 64

MCQ▾

Question

If the time period (T) of vibration of a liquid drop depends on surface tension (S), radius (r) of the drop and density (ρ) of the liquid, then the expression of T is

Choices

Choice (4) Response

a.

T = k

b.

T = k

c.

T = k

d.

None of the above

Question number: 65

MCQ▾

Question

A particle moves along x-axis as x = 4 (t - 3) + a (t - 4) 2

Which of the following is true?

Choices

Choice (4) Response

a.

The initial velocity of particle is 4

b.

The particle is at origin at t = 0

c.

The acceleration of particle is 2a

d.

All of the above

Question number: 66

MCQ▾

Question

Error in the measurement of radius of a circle is 1%. The error in the calculated value of its area is

Choices

Choice (4) Response

a.

3%

b.

2%

c.

7%

d.

1%

Question number: 67

MCQ▾

Question

a particle moving in a straight line covers half the distance with speed of 3 m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s respectively. The average speed of the particle during this motion is

Choices

Choice (4) Response

a.

5.0 m/s

b.

5.5 m/s

c.

4.8 m/s

d.

4.0 m/s

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