KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 178 - 182 of 253

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Question number: 178

» Laws of Motion » Laws of Friction

MCQ▾

Question

A block of mass 3 kg slides on an inclined plane making an angle of 300 with the horizontal. The coefficient of friction between the block and the surface isEquation . The force required to be applied to the block so that it moves down without any acceleration is –

Choices

Choice (4) Response

a.

2.27

b.

3.25

c.

2.0

d.

1.87

Question number: 179

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A ball whose kinetic energy is E, is thrown at an angle of 300 with the horizontal. Its kinetic energy at the highest point of its trajectory will be,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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.

Equation

b.

Equation

c.

Equation

d.

Equation

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