KVPY Stream-SA (Class 11) Physics: Questions 180 - 185 of 252

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Question number: 180

» Electrostatics » Coulomb's Law

MCQ▾

Question

The excess (equal in number) of electrons that must be placed on each of two small sphered 3 cm apart with force of repulsion between sphere to be 10-19 N, is

Choices

Choice (4) Response

a.

125

b.

625

c.

25

d.

50

Question number: 181

» Electronic Devices » Junction Transistor

MCQ▾

Question

In a PNP transistor circuit the collector current is 30 mA. If 75 % of the electrons emitted reach the collector, the value of α and IB are respectively –

Choices

Choice (4) Response

a.

0.85, 5

b.

0.6, 7

c.

0.75, 10

d.

0.7, 11

Question number: 182

» Electrostatics » Capacitors

MCQ▾

Question

40 sheets of mica, each of thickness 0.3 mm are interspersed with aluminum foils of area 35 cm2. The metal sheets are connected alternately to form a system of capacitors. The capacitance of the capacitor is –

Choices

Choice (4) Response

a.

28.91nF

b.

53.73nF

c.

32.16nF

d.

17.16μF

Question number: 183

» Ray Optics » Mirror Formula

MCQ▾

Question

In a concave mirror, an object is placed at a distance 12 cm from the focus and its image is formed at a distance 3 cm from the focus. The focal length of the mirror is,

Choices

Choice (4) Response

a.

4 cm

b.

5 cm

c.

6 cm

d.

3 cm

Question number: 184

» Ray Optics » Power of a Lens

MCQ▾

Question

A convex lens of focal length 21 cm and a concave lens of focal length 17 cm are placed in close contact with one another. The power of the combination is –

Choices

Choice (4) Response

a.

2.43 D

b.

-2.43 D

c.

0.41 D

d.

-1.12 D

Question number: 185

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A ball whose kinetic energy is E, is thrown at an angle of 600 with the horizontal. Its kinetic energy at the highest point of its trajectory will be,

Choices

Choice (4) Response

a.

E

b.

0

c.

E4

d.

E2

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