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Unfortunately, Mr. M. Subramanian, who maintained this website lost his battle to cancer and passed away in July, 2019. The database has over 50,000 questions. If you are interested in purchasing the website/database, please reach out using the form here.

Q1. What is the distance between a crest and adjacent through

l/2

l/4

3l/4

Q2. What is the disadvantage of solar cells?

They do not produce electricity at night

They supply electricity in remote areas

They need complex moving parts

None of the above

Q3. What is the disadvantage of hydro-electric power produced by using a dam?

The power station works only when the tides comes in

River valleys and farmlands are flooded by the dam

The power station only works on rainy days

None of the above

Q4. What is the de Broglie wavelength of an electron moving with a velocity 106 m/s?

10.3 A

8.3 A

3.6 A

7.3 A

Q5. What is the direction of mechanical force produced by a current carrying conductor?

Perpendicular to the direction of magnetic field only

Perpendicular to the direction of current flowing through the conductor

Perpendicular to both

Parallel to the direction of magnetic field.

Q6. What is the complementary colour of yellow light?

Green

Red

Blue

Orange.

Q7. What is the conventional direction of electric current?

Negative to positive

Positive to Negative terminal

Lower potential to higher

Higher to lower resistance.

Q8. What is the colour of sunlight when it is scattered by the dust particles?

Blue

Red

White

Violet.

Q9. What is the combined resistance of 6W and 12W connected in parallel?

18W

Q10. What is the charge possessed by neutron?

Negative

Neutral

Positive

Either positive or negative.

Q11. What is the colour of sky when it is seen from moon’s surface?

Blue

Red

White

Black.

Q12. What is the charge of electron?

Zero

Positive

Negative

Infinity.

Q13. What is the charge of b- rays?

- ve

+ ve

Uncharged

Both +ve and -ve

Q14. What is the cause of the green house effect?

Increase in temperature of the earth

Continuous rainfall

Decrease in temperature of the earth

Continuous snow.

Q15. What is the change in atomic number, when a b - particle is emitted?

Increased by 2

Increased by 1

Decreased by 1

Unchanged

Q16. What is the capacity of fuse wire, used in power circuit?

5 A

220 A

15A

10A

Q17. What is the average dose of X - rays for dental?

0.1 sv

1 msv

O.l msv

0.08 msv

Q18. What is the average dose for chest x- rays?

1 msv

0.1 sv

0.1 msv

0.08 msv

Q19. What is the approximate voltage produced by power stations?

230 V

25,000 V

40,000 V

35,000 V

Q20. What is the apparent depth of the glass slab when an object seen through 10 cm thick glass slab appears to be raised by 3 cm?

14 cm

6cm

10 cm

7 cm

Q21. What is the angular momentum of the electron?

L = Momentum × radius of the orbit

L = Momentum × angular velocity

L = Momentum × (radius)2

L = Momentum / Radius

Q22. What is the angle of deviation of a ray, whose angle of incidence is 80 degree?

20 degree

140 degree

70 degree

40 degree

Q23. What is the angle between displacement and the force applied when the work done is maximum?

0 degree

45 degree

60 degree

90 degree

Q24. What is the angle between electric and magnetic fields of an EM wave?

0 degree

45 degree

90 degree

180 degree

Q25. What is the angle between displacement and force, to get maximum work?

0 degree

60 degree

90 degree

180 degree

Q26. What is the amount of current, when 10 c of charge flows in 4 s through the conductor?

2.4 A

3.5 A

2.5A

4.1A

Q27. What is Sun?

Planet

Moving star

Black body

Non-orbiting star

Q28. what is Shunt?

A low resistance in series

A low resistance in parallel

A high resistance in series

A high resistance in parallel.

Q29. What is seen when the discharge tube is covered with thin black card board?

Dark patch is seen on the screen

A brilliant glow is seen

No glow is on the screen

Dull glow is on the screen.

Q30. What is required for the production of X-rays?

High voltage and high pressure

High voltage and low pressure

Low voltage and high pressure

Low voltage and low pressure

Q31. What is produced in nuclear reactor?

X-rays

High intensity cosmic rays

Charged particles

Radio isotopes.

Q32. What is produced in nuclear reactor?

Alpha particle

Cathode rays ,

Electric charges

Electric power.

Q33. What is one light year equal to?

9.467 × 1015 m

9.46 × 1012 m

8.46 × 1011 m

7.64 × 1012 m

Q34. What is nuclear fission?

Splitting of heavy atom into two lighter nuclei by bombarding with high energy neutrons

Combining two light nuclei to form heavy element

Bombard the heavy atom by low energy neutron to get two lighter nuclei

Two or more nuclei bombarded with each other.

Q35. What is matter composed of?

-ve charges only

+ve charges only

neutral charges only

+ve and -ve charges.

Q36. What is natural radioactivity?

Spontaneous emission process

Instantaneous emission

Stimulated emission process

Induced emission process.

Q37. What is it due to the twinkling of stars?

Refraction

Atmospheric dispersion

Scattering of light

Atmospheric refraction.

Q38. What is induced when magnetic lines are cut by a conductor?

Electric field

Electric current

Magnetic field

Electromotive force.

Q39. What is formed when deuterium fuses with Tortrum?

Hydrogen

Helium

Oxygen

Nitrogen

Q40. What is detected by X-rays?

Disorders in the circulation of blood

Cracks in the body of aero-planes & Automobiles

Target in wars

PH value of blood

Q41. What is created by the relative motion between coil and magnetic field?

Magnetic induction

Induced current

Magnetic field

Induced coil.

Q42. What is called the ratio of change in dimension to the original dimension?

Stress

Strain

Deforming force

Elastic force

Q43. What is called the rate of change in velocity?

Speed

Acceleration

Displacement

Work

Q44. What is called the maximum distance upto which the molecule exerts force of

Sphere of influence

Intermolecular range

Inter-atomic range

Molecular range.

Q45. What is called the distance between the magnetic north and south pole?

Length of a magnet

Equatorial axis

Effective length

Q46. What is atomic number of an atom?

Total number of positrons

Total number of nucleons

Total number of protons

Total number of neutrons

Q47. What is 0 degree C on a Kelvin scale?

–273k

273k

186.5k

–186.5k

Q48. What instrument is used for measuring atmospheric pressure?

Hydrometer

Spygmomanometer

Barometer

Hygrometer

Q49. What happens, when object gets an acceleration?

It always falls towards the earth

Its velocity is increased

Its speed decreases

A force acts on it.

Q50. What happens when X-rays pass through a gas?

Ionizes

Unionizes

Partially Ionizes

Decomposes

Answers Evaluate

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