NEET Physics: Questions 312 - 315 of 2098

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Question number: 312

» Electrostatics » Electric Potential

Assertion-Reason▾

Assertion (Ꭺ)

Electric potential of earth is taken to be zero as a reference.

Reason (Ꭱ)

The electric field produced by earth in surrounding space is zero.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

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

d.

Ꭺ is false but Ꭱ is true

Question number: 313

» Laws of Motion » Force and Inertia

MCQ▾

Question

A stone of mass 1 kg tied to a light inextensible string of length L = 10/6 m is whirling in a circular path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension in the suing is 4 and if g is taken to be 10m/sec 2, the speed of the stone at the highest point of the circle is

Choices

Choice (4) Response

a.

62 m/sec

b.

20 m/sec

c.

7.07 m/sec

d.

103 m/sec

Question number: 314

» Electrostatics » Electric Potential

MCQ▾

Question

In the rectangle shown below, the two corners have charges q 1 = -5 μC and q 2 = +2.0 μC. The work done by external agent in moving a charge q = +3.0 μC slowly from B to A is

(Take l/4π 0 = 10 10 Nm 2 /C 2)

Rectangular figure with charges given

Rectangular Figure With Charges Given

In figure the rectangular having two charges at corners q1=-5 μC and q2 =+2.0 μC.

Choices

Choice (4) Response

a.

5.5 J

b.

2.8 J

c.

3.5 J

d.

4.5 J

Question number: 315

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A boy standing on a weighing machine observes his weight as 200 N. When he suddenly jumps upwards, his friend notices that the reading increased to 400 N. The acceleration by which the boy jumped will be

Choices

Choice (4) Response

a.

9.8 m/s 2

b.

29.4 m/s 2

c.

4.9 m/s 2

d.

14.7 m/s 2

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