NEET Physics: Questions 281 - 286 of 2098

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Question number: 281

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

When the separation between two charges is increased, the electric potential energy of the charges is,

Choices

Choice (4) Response

a.

decreases

b.

may increase or decrease

c.

Remains the same

d.

Increases

Question number: 282

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A ship is steaming towards east at a speed of 10 ms -1. A woman runs across the deck at a speed of 8 ms -1 in the direction at right angles to the direction of motion of the ship i. e. towards north. What is the velocity of the woman relative to sea?

Choices

Choice (4) Response

a.

11.64 m/s

b.

17 m/s

c.

12.806 m/s

d.

17.506 m/s

Question number: 283

» Laws of Motion » Momentum

MCQ▾

Question

A force of 2 N is applied on a particle for 2 sec, the change in momentum will be -

Choices

Choice (4) Response

a.

6 Ns

b.

3 Ns

c.

4 Ns

d.

2 Ns

Question number: 284

» Communication System » Need for Modulation

MCQ▾

Question

The acceleration due to gravity at a place can be determined with the help of a simple pendulum. For this purpose effective length of the pendulum is considered. If ′ be the length of the string and ‘d’ the diameter of the bob then the effective length is equal to

Choices

Choice (4) Response

a.

l + d

b.

l+d2

c.

l-d

d.

ld2

Passage

Capacitor C 3 in the circuit is variable capacitor (its capacitance can be varied). Graph is plotted between potential differences V, (across capacitor C 1) versus C 3, Electric potential V 1 approaches on asymptote of 10 volts as C 3 → ∞

 Circuit Diagram - capacitors C2 and C3

Circuit Diagram - Capacitors C2 and C3

In figure, capacitors C2 and C3 connected in parallel and C1 connected in series. Capacitor C3 is variable capacitor.

Graph of V1→C3 for potential difference

Graph of V1→C3 for Potential Difference

Figure shows the curve between p. d (across capacitor C1) versus variable capacitor C3.

Question number: 285 (1 of 3 Based on Passage) Show Passage

» Electrostatics » Capacitors

MCQ▾

Question

The value of C 3 for which potential difference across C 1 will become 8V, is

Choices

Choice (4) Response

a.

4.5 C 1

b.

1.5 C 1

c.

2.5 C 1

d.

3.5 C 1

Question number: 286 (2 of 3 Based on Passage) Show Passage

» Electrostatics » Capacitors

MCQ▾

Question

The ratio of energy stored in capacitor C 1 to that of total energy when C 3 → ∞ is

Choices

Choice (4) Response

a.

1

b.

Zero

c.

Data insufficient

d.

13

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