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Q1. Which layer of atmosphere blocks the UV rays from the sun?

Ionosphere

Troposphere

Ozone

Strotosphere

Q2. Which lens and what focal length is used by a person having power of 2.50 D?

Concave, 40

Convex, 40

Concave, 0.40

Convex, 0.40

Q3. Which lens has thicker edge and thinner centre?

Convex

Concave

Convex-o-concave

Plano-convex.

Q4. The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?

Ice is a bad conductor of heat.

since the surface of the lake is at the same temperature as the air, no heat is lost

the density of water is maximum at 4 degreeC

None of the statements given above is correct.

Q5. Which lens is used as a reading lens?

Concave

Plano convex

Convex

Plano concave.

Q6. Which lens is used to concentrate the sunlight over a small part of paper? What will happen to that part? .

Convex, burns

Concave, burns

Convex, doesn’t burn

Concave, doesn’t burn

Q7. Which liquid evaporates easily?

Coolant

Condensed liquid

Volatile liquid

Wax

Q8. Which liquid is used in ocean thermal energy, conversion plant?

Water

Liquid sodium

Hydrogen

Liquid ammonia

Q9. Which material core is used in solenoid to make an electromagnet?

Iron

Steel

Soft iron

Cobalt.

Q10. Which material does not absorb IR rays?

Filter

Rock salt

Glass

Lens.

Q11. Which material has more viscous force?

Glycerin

Castor oil

Honey

All the above

Q12. Which material is coated on the screen in Roentgen’s experiment?

Barium platino cyanide

Sodium argento cyanide

Sodium ferro cyanide

Potassium auro cyanide.

Q13. Which material is used in the detection of UV rays?

Copper sulphate

Quinine sulphate

Hydrogen sulphate

Mercuric sulphate.

Q14. Which material is used to absorb the heat produced in the chain reaction?

Coolant

Moderates

Boron

Uranium.

Q15. Which metal is the best conductor of electricity at room temperature?

Copper

Silver

Gold

Aluminium

Q16. Which mirror forms a diminished and virtual images?

Plane

Concave

Convex

All these mirrors

Q17. Which mirror is used as a reflector in street lights?

Concave

Semi-silvered

Plane

Convex.

Q18. Which mirror is used as rear view mirror?

Plane mirror

Concave

Convex mirror

None of the above.

Q19. Which mirror is used in the shaving glass?

Plano convex

Concave

Plano concave

Convex

Q20. Which mirror is, used in the construction of reflecting periscope ?

Convex

Plane

Concave

Parabolic.

Q21. Which model is referred to J.J. Thomson’s atom model?

Liquid drop model

Plum-pudding

Quark

Alpha particle model.

Q22. Which of the energies given below is not energy achieved from the sea?

Wave energy

Nuclear

Thermal

Tidal.

Q23. Which of the following appliance is not based on the principle of heating effect of current?

Electric kettle

Electric bell

Electric bulb

Electric cooker.

Q24. Which of the following can develop a tail when it approaches the sun?

Planet

Asteroid

Comet

Meteor.

Q25. Which of the following can interact with the atoms in the ionosphere?

UV and cosmic rays.

Q26. Which of the following can penetrate through mist, fog haze?

B)UV

Microwaves

Radio waves.

Q27. Which of the following cannot be used to make solar cells

Platinum

Gallium

Germanium

Silicon

Q28. Which of the following constituents of the atmosphere does not absorb solar energy?

CO2

Water vapour.

Q29. Which of the following correctly describes the magnetic field near a long straight wire?

Straight lines perpendicular to the wire .

Straight lines parallel to the wire

Radial lines originating from the wire

Concentric circles centred on the wire.

Q30. Which of the following could be obtained from oceans?

Wind energy

Light energy

Tidal energy

Solar energy.

Q31. Which of the following devices obeys ohm’s law?

Diode valve

Triode value

Junction diode

Metallic coires.

Q32. Which of the following diffract X-rays?

Lens

Mirror

Gravity

Crystal.

Q33. Which of the following does not· change during the refraction of light?

Wave length

Frequency

Velocity of light

All the above

Q34. Which of the following is . based on electromagnetic induction?

Transformer

Galvanometer

Loud speaker

Motor

Q35. Which of the following is a crystalline solid?

Diamond

Wood

Glass

Plastic

Q36. Which of the following is a disadvantage of nuclear energy ?

It generates electricity

It treats disease like cancer

It can be used for a long time

Safe disposable of nuclear wastes.

Q37. Which of the following is a non-renewable source of energy?

Solar

Wind

Natural gas

Biogas.

Q38. Which of the following is a renewable source of energy?

Petroleum

Coal

Natural gas

Biogas.

Q39. Which of the following is a scalar quantity?

Induced emf

Induced current

Magnetic induction

Magnetic flux.

Q40. Which of the following is a source of alternating current?

Dry cells

button cells

Lead accumulators

Thermal plants

Q41. Which of the following is a vector quantity?

Speed

Distance

Work

Displacement

Q42. Which of the following is a vector?

Electric flux

Magnetic induction

Magnetic flux

Magnetic clip.

Q43. Which of the following is a wrong statement?

Alternating current reverses its direction periodically

The frequency of domestic AC is 50 Hz

DC always flows in only one direction

Power loss is more in AC transmission than DC.

Q44. Which of the following is a wrong statement?

AC reverses its direction periodically

Current supply in our houses in AC

Transmission of AC causes more power loss than that of DC

Magnitude of AC changes with time

Q45. Which of the following is an advantage of nuclear fuels?

They are renewable energy resources

They do not emit harmful radiation

They do not produce green house gases.

None of the above

Q46. Which of the following is based on electromagnetic induction?

Transformer

Galvanometer

Loud speaker

Motor.

Q47. Which of the following is considered a disadvantage of wind farms?

They use a renewable energy source

They are noisy and unsightly

They do not produce electricity at night.

None of the above

Q48. Which of the following is correct

P = 12 R

P = IR

P = VR

P = I2/R

Q49. Which of the following is correct?

Red + blue = green

Red + green = cyan

Green + blue = white

Red + blue = magenta

Q50. Which of the following is non-renewable source of energy?

Coal

Gobar gas

Solar energy

Tidal

Answers Evaluate

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