NEET Physics: Questions 339 - 342 of 2098

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Question number: 339

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A swimmer who can swim in a river with speed mv (with respect to still water) where v is the velocity of river current, jumps into the river from one bank to cross the river. Then

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

(1) If m < 1 he cannot cross the river

(2) If m < 1 he cannot reach a point on other bank directly opposite to his starting point.

(3) If m > 1 he can reach a point on other bank

(4) He can reach the other bank at some point, whatever be the value of m.

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1, 2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

Question number: 340

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

Question

A block of metal weighing 2 kg is resting on a frictionless plane. It is stick by a jet releasing water at a rate of 1 kg/s and at a speed of 5 m/s. The initial acceleration of the block will be –

Choices

Choice (4) Response

a.

0

b.

2.5 m/s 2

c.

0.4 m/s 2

d.

5 m/s 2

Question number: 341

» Electrostatics » Electric Field

MCQ▾

Question

Figure shows the electric lines of force emerging from a charged body. If the electric field at A and B are E A and E B respectively and if the distance between them is r then

Non-uniform electric field

Non-Uniform Electric Field

Non-uniform elecric force lines. At A point region lines are more dance than B point region.

Choices

Choice (4) Response

a.

E A > E B

b.

EA=EBr2

c.

EA=EBr

d.

E A < E B

Question number: 342

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

Two equal charges q are placed at a distance of 2a and a third charge -2q is placed at the midpoint. The potential energy of the system is

Choices

Choice (4) Response

a.

6q28πϵ0a

b.

- 7q28πϵ0a

c.

q28πϵ0a

d.

9q28πϵ0a

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