# NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 239 - 242 of 2142

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## Question number: 239

MCQ▾

### Question

Two equal negative point charges 2µC place1 m apart from each other in air. so what is the potential energy of the system?

### Choices

Choice (4) Response

a.

2eV

b.

2 J

c.

4 J

d.

0.036 J

## Question number: 240

MCQ▾

### Question

A student performs an experiment for determination of . The error in length is ∆ and in time T is ∆ T and n is number of times the reading is taken. The measurement of g is most accurate for

### Choices

Choice (4) Response

a.

∆l = 5mn, ∆ T = 0.2 sec, n = 10

b.

∆l = 5mn, ∆T = 0.2 sec, n = 20

c.

∆l = 5mn, ∆T = 0.1 sec, n = 10

d.

∆l = 1mn, ∆T = 0.1 sec, n = 50

## Question number: 241

MCQ▾

### Question

Two bodies P and Q are moving along positive x-axis their position-time graph is shown below. If VPQ is velocity of P w. r. t. Q and VQP is velocity of Q w. r. t P, then

Select the correct answers and mark it according to the following codes:

(1)

(2)

(3)

(4)

### Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

## Question number: 242

MCQ▾

### Question

In the electric field of a point charge q, a certain charge is carried from point A to B, C, D and E. Then the work done by electric force is

### Choices

Choice (4) Response

a.

Zero along all the paths AB,

b.

Least along AE

c.