NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 51 - 53 of 2320

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Question number: 51

» Kinematics » Average Speed and Instantaneous Velocity

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MCQ▾

Question

From the top of a multistoried building 40m tall, a boy projects a stone vertically upwards with an initial velocity of 10 ms -1 such that it eventually falls to the ground.

(1) After 4 s the stone will strike the ground

(2) After 2 s the stone will pass through the point from where it was projected

(3) Its velocity when it strikes the ground is 30 m/s

(4) Its velocity when it strikes the ground is 40 m/s

Choices

Choice (4)Response

a.

1 and 3

b.

1 and 2

c.

1,2 and 3

d.

2 and 4

Question number: 52

» Physics and Measurement » Dimensions of Physical Quantities

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MCQ▾

Question

Number of particles crossing unit area perpendicular to X-axis in unit time is given by n =-D n 2 - n 1 x 2 - x 1

, where n1 and n2 are number of particles per unit volume in the position x1 and x2. Find dimensions of D called as diffusion constant.

Choices

Choice (4)Response

a.

[M 0 L T -3]

b.

[M0 L2 T -4]

c.

[M 0 L 2 T -1]

d.

[M 0 L T 2]

Question number: 53

» Dual Nature of Matter and Radiation » Hertz and Lenard's Observations

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Unit of Rydberg constant R is m-l

Reason (Ꭱ)

It follows from Bohr’s formula v = R [

-

] the symbols have their usual meaning.

Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

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

d.

Both Ꭺ and Ꭱ are false

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