# CBSE Class 11 Physics MCQs Set 7

## Physics Class 11 MCQ

Class 11 Physics students should refer to the following multiple-choice questions with answers for Physics in standard 11. These MCQ questions with answers for Grade 11 Physics will come in exams and help you to score good marks

### Class 11 Physics MCQ Questions with Answers

Question. A current of 5 A passes along a wire of length 1.0 m. the wire is at right angles to a magnetic field of flux density of 0.15 T. The force acting on the wire is...
A. 0
B. 0.03 N
C. 0.75 N
D. 33 N

Question. The end product of most radioactive decay series is usually some form of
A. carbon
B. helium
C. hydrogen

Question. The cause of surface tension is...
B. cohesive forces
C. external forces
D. gravitational force

Question. The unit 'poise' is...
A. dyne.sec/cm
B. dyne.cm/sec
C. newton.sec/m
D. dyne.sec/cm

Question. Emission line spectrum will be obtained from...
A. candle flame
B. sodium lamp
C. Sun
D. white hot filament of an electric bulb

Question. A hollow insulated brass sphere is positively charged. The electric potential inside the sphere is...
A. zero
B. greater than the potential at the surface
C. smaller than the potential at the surface
D. the same as that on the surface

Question. The linear momentum of a body is P = a + (bt2/2). The force acting on the body is...
A. a + (bt/2)
B. a + bt
C. bt/2
D. bt

Question. The weight of a body on the surface of earth is 100 N. Its weight at a depth half way to the centre of earth will be...
A. 50 N
B. 100 N
C. 25 N
D. 125 N

Question. Two wires C and D of the length in the ratio 2 : 3, diameter in the ratio 2 : 3 and of the same material, are subjected to same force. Then the ratio of their extensions lc : ld is...
A. 3 : 2
B. 2 : 3
C. 4 : 9
D. 8 : 27

Question. The potential energy of a harmonic oscillator is maximum when the displacement is equal to...
A. zero
B. 1/2 amplitude
C. amplitude
D. 1/4 amplitude

Question. When the forces acting on a body are in equilibrium, its...
A. velocity is zero
B. displacement is zero
C. acceleration is zero
D. momentum is zero

Question. An object at rest may possess...
A. velocity
B. momentum
C. kinetic energy
D. potential energy

Question. A nonconservative force does not give rise to...
A. thermal energy
B. kinetic energy
C. light energy
D. potential energy

Question. Atoms forming a molecule attain the arrangement in which they obtain...
A. zero potential energy
B. minimum potential energy
C. maximum potential energy
D. none of the above

Question. Bulk modulus of a liquid is...
A. higher than that for a solid
B. higher than that for a gas
C. lower than that for a gas
D. zero

Question. The CGS unit of coefficient of viscosity is...
A. dyne.second/cm2
B. newton.second/cm2
C. dyne.(second)2/cm2
D. newton.second/cm

Question. The volume of a gas sample is directly proportional to its...
A. Fahrenheit temperature
B. Celsius temperature
C. Kelvin temperature
D. pressure

Question. The approximate relationship between the coefficient of linear expansion(α) and the coefficient of cubical expansion(γ) is...
A. γ = α2
B. γ = α3
C. α = 3 γ
D. γ = 3 α

Question. When capacitors are in parallel...
A. they are all at the same potential
B. they are at different potentials
C. their capacitances are equal
D. the equivalent capacitance is zero

Question. The earth's magnetic field at sea level is...
A. 3 x 10-9 T
B. 3 x 109 T
C. 3 x 10-5 T
D. 3 x 105 T

Question. Monoatomic gases give...
A. line spectra
B. band spectra
C. continuous spectra
D. line and band spectra

Question. The centre of mass of a rigid body...
A. lies inside the body
B. lies outside the body
C. can be inside or outside of the body
D. may not exist

Question. If 'l' is the length of a simple pendulum and 'T' its period, then 'g' is given by...
A. (4π2l)/T2
B. 2π/(√ l/t)
C. 2πl/t
D. (4πl2)/t2

Question. The rate at which an object radiates electromagnetic energy does not depend on its...
A. surface area
B. mass
C. temperature

Question. Which of the following is neither a basic physical law nor derivable from one?
A. Coulomb's law
B. Ohm's law
C. Kirchhoff's first law
D. Kirchhoff's second law

Question. The power dissipated as heat in an a.c. circuit depends on its...
A. resistance
B. inductive reactance
C. capacitive reactance
D. impedance

Question. Impedance is a maximum at resonance in...
A. a series RLC circuit
B. a parallel RLC circuit
C. all RLC circuits
D. no RLC circuit

Question. Red shift indicates...
A. recession of star
B. approaching movement of star
C. that red light changes to violet
D. that violet light changes to red

Question. The penetration power of beta particles is 1. Then the relative penetration power of gamma rays is...
A. 1
B. 100
C. 1/1000
D. 1000

Question. In a common-base circuit the current gain is...
A. 0
B. 1
C. greater than 1
D. smaller than 1

## Tags:

Click for more Physics Study Material
 CBSE Class 11 Physics Physical World MCQs
 CBSE Class 11 Physics Units and Measurements MCQs
 CBSE Class 11 Physics Motion in a Straight Line MCQs
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 CBSE Class 11 Physics Systems of Particles and Rotational Motion MCQs
 CBSE Class 11 Physics Gravitation MCQs
 CBSE Class 11 Physics Mechanical Properties of Solids MCQs
 CBSE Class 11 Physics Mechanical Properties of Fluids MCQs
 CBSE Class 11 Physics Thermal Properties of Matter MCQs
 CBSE Class 11 Physics Thermodynamic MCQs
 CBSE Class 11 Physics Kinetic Theory MCQs
 CBSE Class 11 Physics Oscillations MCQs
 CBSE Class 11 Physics Waves MCQs

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