NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 453 - 456 of 2184

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Question number: 453

» Rotational Motion » Angular Momentum

Edit
Assertion-Reason▾

Question

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 false

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 454

» Electrostatics » Electrostatic Potential Energy

Edit
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

Edit
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 F > v r

b.

v F = v r

c.

v F = 2v r

d.

v r = 2v F

Question number: 456

» Current Electricity » Potential Difference and EMF of Cell

Edit
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 then the current would be

Choices

Choice (4) Response

a.

Greater than 2I

b.

less than I

c.

Greater than I but less than 2I

d.

I