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Q1. The velocity of light in glass is ........ × 108 m/s. (Mg = 1.5)

1.5

2.5

0.5

Q2. The velocity of light in air is 3 × 108 m/s and the velocity of light in water is 2.25 × 102 m/s, what is the refractive index of water?

2.33

0.33

3.33

1.33

Q3. The velocity of light in a diamond is 2/3 of its velocity in air. The refractive index of diamond is

0.0666

1.5

Q4. The velocity of every liquid particle is same at a particular point. What is its Reynold number?

2000 - 3000

0-2000

2500 - 3500

2000-2500

Q5. The velocity of an object is doubled, its K.E will be increased by

Three times

Four times

Eight times

KE does not change with velocity.

Q6. The varying magnetic flux in the primary coil due to alternating current links .......

Only the secondary coil

Only the primary coil

Both primary and secondary coils

Neither primary nor secondary

Q7. The value of Reynold number lies between 0 to 2000 the flow is called

Turbulent

Stream lined

Steady

Unsteady

Q8. The value of Planck’s constant his

6.265 × 10–34 JS

6.625 × 10–34 JS

1.625 × 10–34 JS

6.625 × 1034 JS

Q9. The value of gravitational constant is

Same at all planets and satellite

Different at all places of earth.

Different at different places

None of the above.

Q10. The value of acceleration due to gravity is

Same at all places of the earth

Same at all planets and satellites

Different at different places

None of the above.

Q11. The unit of latent heat of fusion of a substance is ......... .

Jkg–1

Jkg–1 k

Jkg–1k–1

JK.

Q12. The transmutation of nonradioactive into radioactive element is called .................

Artificial radioactivity

Natural radioactivity

Chain reaction

Nuclear fusion.

Q13. The transmission of ............. is more expensive.

Alternating current

Unidirectional current

Electromotive force

Magnetic flux.

Q14. The transformer consists of insulated copper coils wound on either side of a ...........

Thin laminated iron sheets

Laminated soft aluminium core

Laminated soft-iron core

Soft-iron core

Q15. The total number of protons in the nucleus gives what?

Mass number

Molecular number

Neutron number

Atomic number

Q16. The total number of nucleons in the nucleus of the atom is called ............

Neutron number

Atomic number

Mass number

Reynold number

Q17. The total number of magnetic lines of force crossing unit area held normal to the magnetic lines is called

Electrostatic induction

Magnetic induction

Electromagnetic induction

Magnetic flux.

Q18. The total mass of the fissionable material in an uncontrolled chain reaction is ..............

Less than its critical mass

Greater than its critical mass

Equal to its critical mass

Zero

Q19. The time period of geostationary satellite is the same as that of

Moon

Mars

Venus

Earth.

Q20. The time period of a simple pendulum does not depend on

Mass of the bob

Frequency of its oscillation

Acceleration due to gravity

Its length

Q21. The threshold wavelength of sodium metal is 6780 Å. The work function of metal will be

2.75 ev

1.83 ev

2.95ev

3.25 ev.

Q22. The three little bones in the middle ear are .......... the anvil, the stirrup.

Hammer

Cochlea

Eardrum

Iris

Q23. The theoretical prediction of electromagnetic waves was first made by

Hertz

C.V Raman

Broglie

Maxwell.

Q24. The terminal velocity obtained by a rain drop of radius 0.3 mm falling through air viscosity 1.8 × 10–5 NSm–1 is

1.088 rn/s

10.88 rn/s

1.66 rn/s

1.044 rn/s

Q25. The temperature of a body is a measure of the

Average K.E of the molecules

Total energy of the molecules

Velocity

Average P.E of the molecules

Q26. The splitting of white light into colours is

Deviation

Reflection

Dispersion

Scattering.

Q27. The splitting of colours is called

Reflection

Refraction

Dispersion

Deviation.

Q28. The speed of the planet is ......... at the perigee position. Minimum

Maximum

Equal

None of these.

Q29. The split rings in a DC generator is used to .............

Step up the current

Step down the current

Invert the current

Reverse the current

Q30. The speed of the bob of a simple pendulum

Is maximum at the mean position

Is constant throughout the motion

Maximum at the external position

Is zero at each of the extreme

Q31. The speed of rotation of an electric motor can be increased by

Increasing the strength of the magnetic field

Decreasing the number of turns in the coil

Decreasing the current in the coil

Decreasing the area of cross-section.

Q32. The speed of electro magnetic waves is independent of

Intensity

Frequency

Wavelength

Medium in which it travels.

Q33. The speed of DC motor can be increased by .............

Changing the polarity of the magnetic poles

Decreasing the strength of the magnetic field

Increasing the number of turns of a coil

Decreasing the number of turns

Q34. The spectral lines having higher frequencies than that of incident light are called

Stokes lines

Raman lines

Antistokes lines

Fraunhofer lines.

Q35. The specific resistance of a wire of length ‘L’ is x. If it is cut into two halves, then the specific resistance of the wire of length L/2 will be

0.5x

Q36. The specific heat capacity of water is

4180 Jkg–1 k–1

138 Jkg–1k–1

226 Jkg–1k–1

None

Q37. The source of energy in sun is ...........

Chemical energy

Gravitational energy

Fusion energy

Fission energy.

Q38. The source of energy in sun and stars is

Nuclear fission

Oxidation

Nuclear fusion

Thermal reaction.

Q39. The safety device used for electrical appliances is

Connecting wire

Resistance

Fuse

None of the above.

Q40. The size of the particles present in a solution is large. When white light is passed through this solution, the colour of the scattered light is ...............

Red

Violet

Blue

White.

Q41. The restoring force per unit area of a deformed body is known as

Deforming force

Stress

Strain

Elastic limit

Q42. The restoring force per unit area is known as

Elastic limit

Deforming force

Stress

Strain

Q43. The resistivity of a wire depends on its

Length

Area of cross section

Shape

Material

Q44. The resistivity of a wire

Varies with its length

Varies with cross section

Varies with its mass

Independent of length cross-section and mass.

Q45. The resistivity of a material is independent of

Shape and size of the conductor

Temperature of the conductor

Shape alone

Nature of the material

Q46. The resistance offered by an object to an applied force is referred to as

Friction

Inertia

Reaction

Potential.

Q47. The relation between the coefficient of volume expansion and coefficient of linear expansion is

V = 2 a

V = 3 a

V = 4 a

V = a

Q48. The relation between linear velocity and angular velocity is

v = rw

W = rv

w = rv2

r = vw

Q49. The relation between linear magnification ‘m’ and image distance ‘v’ is given by

M = 2f/t – v

M = f – v/f

M = 2f/t + v

M = f + v/2f

Q50. The refractive indices of two substances A and B are 1.5 and 2. In which medium light travels faster?

In A

In B

Same speed in both

Information is not sufficient

Answers Evaluate

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