KVPY Stream-SA (Class 11) Physics: Questions 154 - 158 of 242

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Question number: 154

» Work, Energy and Power » Potential Energy

MCQ▾

Question

Potential energy of a spring when stretched by 8 cm is U. When stretched by 32 cm, its potential energy will be,

Choices

Choice (4) Response
a.

4U

b.

16U

c.

U4

d.

U16

Question number: 155

» Kinematics » Relative Velocity

MCQ▾

Question

A thief is running away on a straight road with velocity 3 m/s. A policeman chases him with velocity 3.5 m/s. Initially the thief was 250 m ahead of the policeman. The time taken by policeman to catch the thief is –

Choices

Choice (4) Response
a.

9 min

b.

7 min 15 sec

c.

7 min 50 sec

d.

8 min 20 sec

Question number: 156

» Atoms and Nuclei » Composition and Size of Nucleus

MCQ▾

Question

A nucleus of bismuth 83209Bi emits three electrons followed by two alpha particles. The resulting nucleus will have –

Choices

Choice (4) Response
a.

78 protons and 134 neutrons

b.

82 protons and 92 neutrons

c.

82 protons and 128 neutrons

d.

80 protons and 119 neutrons

Question number: 157

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

MCQ▾

Question

Three infinitely long identical conductors are placed along OX, OY and OZ of coordinate axes, O being their common end. Current in OX is 2I and those in OY and OZ are I and I. The magnetic field at point P (0, -d, 0) is –

Choices

Choice (4) Response
a.

5μ04πId

b.

μ04πId

c.

2μ04πId

d.

5μ04πId

Question number: 158

» Electrostatics » Capacitors

MCQ▾

Question

70 sheets of mica, each of thickness 0.25 mm are interspersed with aluminum foils of area 50 cm2. The metal sheets are connected alternately to form a system of capacitors. The capacitance of the capacitor is –

Choices

Choice (4) Response
a.

91.25nF

b.

77.16μF

c.

86.73nF

d.

77.16nF

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