NEET Physics: Questions 453 - 456 of 2099

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Question number: 453

» Rotational Motion » Angular Momentum

Assertion-Reason▾

Assertion (Ꭺ)

Torque is equal to rate of change of angular momentum.

Reason (Ꭱ)

Angular momentum depends on moment of inertia and angular velocity.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
b. Ꭺ is false but Ꭱ is true
c. Both Ꭺ and Ꭱ are false
d. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 454

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

If V and u are electric potential and energy density, respectively, at a distance r from a positive point charge, then which of the following graph is correct?

Choices

Choice (4) Response
a.
Option A graph of V2→u

Option a Graph of V2→U

figure shows that the graph of V2→u is not linear

b.
 Option B graph of V2→u

Option B Graph of V2→U

figure shows that the graph of V2→u is not linear

c.
Option C graph of V2→u

Option C Graph of V2→U

Figure shows that the graph of V2→u is lenear and it pass though origin.

d.
Option D graph of V2→u

Option D Graph of V2→U

Figure shows that the graph of V2→u is linear sloping downwards

Question number: 455

» Rotational Motion » Angular Momentum

MCQ▾

Question

In a bicycle, the radius of rear wheel is twice the radius of front wheel. If r F and r r are the radius, v p and v r are speeds of top most points of wheel, then

Choices

Choice (4) Response
a.

v r = 2v F

b.

v F = v r

c.

v F = 2v r

d.

v F > v r

Question number: 456

» Current Electricity » Potential Difference and EMF of Cell

MCQ▾

Question

When a cell of emf E and internal resistance r, is connected to the ends of a resistance R, then current through resistance is I. If the same cell is connected to the ends of a resistance R2 then the current would be

Choices

Choice (4) Response
a.

less than I

b.

I

c.

Greater than I but less than 2I

d.

Greater than 2I

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