NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 344 - 347 of 2184

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Question number: 344

» Properties of Solids & Liquids » Viscosity

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MCQ▾

Question

A jar is filled with two non-mixing liquids 1 and 2 having densities ρ 1 and, ρ 2 respectively. A solid ball, made of a material of density ρ 3, is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for ρ 1, ρ 2 and ρ 3 ?

 Equilibrium condition in jar

Equilibrium Condition in Jar

Jar filled with two non-mixing liquid having density ρ1 and ρ2, and a solid ball, made of a material of density ρ3. All are in equilibrium condition

Choices

Choice (4) Response

a.

ρ 1 > ρ 3 > ρ 2

b.

ρ 3 < ρ 1 < ρ 2

c.

ρ 1 < ρ 2 < ρ 3

d.

ρ 1 < ρ 3 < ρ 2

Question number: 345

» Electrostatics » Electric Potential

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MCQ▾

Question

Ten electrons are equally spaced and fixed around a circle of radius R. Relative to V = 0 at infinity, the electrostatic potential V and the electric field E at the center C are

Choices

Choice (4) Response

a.

V = 0 and

b.

V = 0 and

c.

V ≠ 0 and

d.

V ≠ 0 and

Question number: 346

» Rotational Motion » Torque

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Torque due to force is maximum when angle between r and F is 90°.

Reason (Ꭱ)

The unit of torque is newton- meter.

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: 347

» Kinematics » Uniform and Non-Uniform Motion

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MCQ▾

Question

An engine of mass 5 x 10 4 kg pulls a coach of mass 4 x 10 4 kg. Suppose that there is a resistance of 1 N per 100 kg acting on both coach and engine, and that the driving

force of engine is 4500 N. The acceleration of the engine and tension in the coupling will respectively be

Choices

Choice (4) Response

a.

0.04 m/s 2, 2000 N

b.

4 m/s 2, 200 N

c.

0.4 m/s 2, 200 N

d.

0.4 m/s 2, 20 N