NEET Physics: Questions 348 - 351 of 2099

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Question number: 348

» Electrostatics » Capacitors

MCQ▾

Question

There is an air filled l pF parallel plate capacitor. When the plate separation is doubled and the space is filled with wax, the capacitance increases to 2pF. The dielectric constant of wax is

Choices

Choice (4) Response
a.

6

b.

YO

8

c.

4

d.

2

Question number: 349

» Laws of Motion » Force and Inertia

MCQ▾

Question

A cricket ball of mass 250 gm moving with a velocity of 25 m/s is hit by a bat so that it acquires a velocity of 30 m/s in the opposite direction. The force acting on the ball, if the contact time is 1/100 of a second, will be -

Choices

Choice (4) Response
a.

632.5 N in the initial direction of ball

b.

1300 N in the final direction of ball

c.

1.345 N in the initial direction of ball

d.

130 N in the final direction of ball

Question number: 350

» Electrostatics » Capacitors

MCQ▾

Question

In the figure a capacitor is filled with dielectrics K 1, K 2 and K 3. The resultant capacitance is

Capacitor filled with dielectrics

Capacitor Filled With Dielectrics

In figure a capacitor filled with dielectrics K1, K2 and K3.

Choices

Choice (4) Response
a.

ϵ0Ad(1K1+1K2+1K3)

b.

2ϵ0Ad(1K1+1K2+1K3)

c.

2ϵ0Ad(K1+K2+K3)

d. None of the above

Question number: 351

» Rotational Motion » Angular Momentum

MCQ▾

Question

If the earth is a point mass of 6 x l0 24 kg revolving around the sun at a distance of 1.5xl0 8 km and in time T = 3.14 xl0 7 s. Then the angular momentum of the earth around the sun is

Choices

Choice (4) Response
a.

1.8 x 10 29 kg m 2 /s

b.

2.7 x 10 40 kg m 2 /s

c.

1.5 x 10 37 kg m 2 /s

d.

1.2 x 10 18 kg m 2 /s

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