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Q1. What happens when white light falls on non-parallel surfaces of a glass block?

Scattering

Dispersion

Diffraction

None of the above.

Q2. What happens when oil is added on the surface of water?

Surface tension is increased

Viscosity is increased

Surface tension is decreased

Viscosity is decreased

Q3. What happens when a ray or light enters a glass slab from air?

i > r

i < r

i = r

r = 2i

Q4. What happens when a monochromatic beam of light passes from denser to rarer medium?

Velocity increases

Wave length decreases

Velocity decreases

Frequency decreases

Q5. What happens to the speed of light when it is refracted from water into air?

Speed increases

Speed decreases

Remains same

It moves from rarer to denser medium

Q6. What happens to the resistance of a thermistor when the light level is increased?

It decreases

It Increases

It remains same

Q7. What happens to the resistance of resistor when the temperature is increased?

Decreases

Increases

It stays the Same

Q8. What happens to the resistance of a LDR when the light level is increased?

It decreases

It remains same

It increases

Q9. What happens to the mass number by an emission of a-particle?

Decreased by 1

Increased by 2

Decreased by 4

Increased by 4

Q10. What happens to the boiling point when the pressure above the liquid is high?

Increases

Decreases

Remains same

Increase and then decrease

Q11. What happens in an uncontrolled chain reaction?

Small amount of energy is absorbed

Enormous amount of energy is absorbed

Small amount of energy is released

Enormous amount of energy is released.

Q12. What happened when ebonite rod is rubbed with fur?

Electrons move from the fur to the ebonite rod

Protons move from fur to ebonite

Electrons move from ebonite to fur.

Protons move from ebonite to fur

Q13. What form of energy is stored in a battery?

Electrical

Chemical

Light

None of these

Q14. What happened to the surface tension of a liquid when temperature increases?

Decreases

Increases

No change

Either decreases or increases

Q15. What does the water gas consist?

Water vapor and coal

Mixture of CO and H2

Mixture of CO and N2

Water vapour and methane

Q16. What does the term ‘inexhaustible natural resources’ mean?

Not exhausted by micro-organisms

Exhausted by human utilization

Exhausted by micro-organisms

Not exhausted by human utilization.

Q17. What does the slope of velocity - time graph represent?

Acceleration

Speed

Displacement

Force

Q18. What does the natural gas mainly consists of?

SO2

CH4

CO2

Q19. What does the ohm’s law deal?

Current and potential difference

Charge and resistance

Electrical energy and resistance

None of the above

Q20. What does the hair spring in a moving coil galvanometer provide?

Couple

Restoring couple

Force

Deflecting couple

Q21. What do we use to see the fractures and deformalities in bones?

b -rays

a -rays

g -rays

X-rays

Q22. What does show large scattering of a particles in gold foil experiment?

An atom IS a +ve charged sphere

+ve charge concentrated at the centre

Atom has no electrons

–ve charge is concentrated at the centre.

Q23. What discovery did the a-scattering experiment lead to?

Neutron

Atom

Nucleus

Electron

Q24. What colour is obtained when a primary and a secondary colour are mixed together?

Red

Blue

White

Black

Q25. What colour does a blue filter transmit?

White

Red

Blue

Green.

Q26. What are X-rays?

Negatively charged particles

Positively charged particles

Not charged particles

None of the above.

Q27. What are the worst emitters of thermal radiation

Light, shiny surfaces

Light, dull surfaces

Black, dull surfaces

Q28. What are X-rays?

Photons of high energy

Protons of high energy

Protons of low energy

Photons of low energy.

Q29. What are the two types of inter atomic forces exist in the liquids?

Cohesive, viscous

Cohesive, adhesive

Cohesive, elastic

Adhesive, viscous

Q30. What are the sources of IR light?

Stars

Electric bulbs

Incandescent solids

Very hot bodies.

Q31. What are the rays released during the explosion of atom bomb?

Beta and gamma

Gamma

Visible light, U, V X- rays

Cosmic

Q32. What are the quantities remaining constant in a collision?

Momentum, K.E but not temp

Momentum, temp and not K.E

Momentum, K.E temp

Momentum, but neither K.E nor temp.

Q33. What are the particles emitted in natural radio action?

Only b-particle

Only gamma

a, b and g

X Ray

Q34. What are the objects found between orbits of Mars and Jupiter?

Comets

Meteors

Asteroids

Meteorites

Q35. What are the invisible radiations emitted by uranium .........

X- rays

a, b and g

UV - rays

Q36. What are the factors angle of deviation depend upon?

Angle of incidence

Refractive index of the prism

The angle of the prism

All of the above.

Q37. What are the factors affecting surface tension?

Temperature

Impurities

Density

Temperature and impurities.

Q38. What are asteroids?

Planets

Huge lumps of rocks

Frozen gases

Natural satellites.

Q39. What are the best absorbers of thermal radiation?

.Light, dull surfaces

Black, shiny surfaces

Black, dull surfaces

None of these

Q40. What are a - particles?

Helium nuclei

Electrons

Neutrons

Protons

Q41. Watt-hour is equal to ............ J?

1000

3600

36000

10000

Q42. Velocity of sound in air is ?

3 × 108 m/s

300 m/s

3 × 1010 m/s

3 × 103 m/s

Q43. Watt governor makes use of the

Centripetal force

Mechanical force

Centrifugal force

Kinetic force.

Q44. Variation in the amount of starlight entering the eye causes the ........... effect of stars.

Scattering

Tyndall

Reddening

Twinkling

Q45. Vaporization point and ......... have the same numerical value.

Solidification point

Liqufication point

Fusion point

Melting point

Q46. Uniform linear motion is ......... motion.

Non accelerated

Relative

Constant

Accelerated

Q47. Uniform circular motion is ................ Motion.

Accelerated

Non-accelerated

Relative

Constant

Q48. Tyndall effect is due to

Scattering of light

Reflection of light

Refraction

Dispersion of light

Q49. Ultraviolet region was detected by whom?

Hertz

J.C. Bose

Marconi

J. Rither

Q50. Two wires of resistance 10W and 20W are connected in series with a battery. The rate at which heat is produced by 10W is 40 J/s. The rate at which heat is produced by 20 W is ..... J/s

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