NEET Physics: Questions 447 - 451 of 2098

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Question number: 447

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A man is walking on a level road at a speed of 3 km/h. Raindrops fall vertically with a speed of 4 km/h. Find the velocity of raindrops with respect to the men.

Choices

Choice (4) Response

a.

4 km/hr

b.

7 km/hr

c.

5 km/hr

d.

3 km/hr

Question number: 448

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

Question

A boy standing on a weighing machine observes his weight as 100 N. When he suddenly jumps upwards, his friend notices that the reading increased to 300 N. The acceleration by which the boy jumped will be

Choices

Choice (4) Response

a.

3.27 m/s 2

b.

19.6 m/s 2

c.

29.4 m/s 2

d.

32.7 m/s 2

Question number: 449

» Electrostatics » Electric Potential

MCQ▾

Question

Two electric charges 12 μC and -6 μ C are placed 20 cm apart in air. If there will be a point P on the line joining these charges and outside the region between them, at which the electric potential is zero, and then the distance of P from - 6μC charge is

Choices

Choice (4) Response

a.

0.20 m

b.

0.15 m

c.

0.25 m

d.

0.10 m

Question number: 450

» Electrostatics » Electrostatic Potential Energy

MCQ▾

Question

A positive charge is moved from a low potential point A to high potential point B. Then the electric potential energy of the system

Choices

Choice (4) Response

a.

Nothing definite can be predicted

b.

Increases

c.

Decreases

d.

Will remain the same

Question number: 451

» Electrostatics » Electric Field Lines

Assertion-Reason▾

Assertion (Ꭺ)

Electric lines of force cross each other.

Reason (Ꭱ)

Electric field at a point superimpose to give one resultant electric field.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

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