Khub.info Learn TNPSC exam and online pratice

WEBSITE AND DATABASE FOR SALE

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 order of molecular range in liquids?

10–10 m

10–9 m

10–3 m

10–11 m

Q2. What is the order of temperature when atom bomb exploded?

Billions of degree celsius

Millions of degree kelvin

Millions of degree celsius

Billions of degree kelvin.

Q3. What is the orbital velocity of a satellite revolving near the earth’s surface?

7.92 m/s

8.92 m/s

5.92 m/s

6.92 m/s

Q4. What is the number of neutrons for an atom having atomic number Z and mass number A?

A + Z

A – Z

Z – A

A – Z 2

Q5. What is the nature of the wire when a current is flowing through it?

Positively charged

Neutral

Partially charged

Negatively charged

Q6. What is the nature of the image formed by concave lens

Real, inverted

Real, erect

Virtual, erect

Virtual and inverted

Q7. What is the natural source of IR and UV rays?

Moon

Sun

Earth

Jupiter.

Q8. What is the name of the fluid between the retina and the lens?

Aqueous humor

Vitreous humor

Aqua

Humus.

Q9. What is the name of coating an iron with zinc?

Galvanization

Electroplating

Ionization

None of the above.

Q10. What is the minimum energy required to remove an electron?

Work function

K.E

Stopping potential

Potential energy

Q11. What is the momentum of a photon of wavelength 5000 Å?

1.3 × 10–27 kgms–1

1.3 × 10–28 kgms–1

4 × 10–29 kgms–1

4 × 10–18 kgms–1

Q12. What is the minimum distance required for producing echo?

1.7 m

17m

10 m

300 m

Q13. What is the maximum value of frequency of FM band ?

109 Hz

1012 Hz

107Hz

11 KHz

Q14. What is the maximum power of accommodation of an eye for a person with normal vision

Q15. What is the mathematical form of magnification for a spherical mirror?

M = –u/v

M = –v/u

M = (v/u) (h/h1)

M = u/v

Q16. What is the mass of an object having the volume of 50 m3 and density of 10 kgm3?

60 kg

500 kg

5 kg

None of the above.

Q17. What is the mass of an electron?

9.1 × 10–31 g

9.1 × 10–31 kg

1.6 × 10–9 g

1.6 × 10–9 kg

Q18. What is the mass of a neutron?

9.11 × 10–31 kg

1.66 × 10–27 kg

1.6 × 10–19 kg

1.675 × 10–27 kg

Q19. What is the mass number of an element contaiing 20 neutrons and its atomic number is 12?

100

120

Q20. What is the main disadvantage of solar cells?

They have no moving parts

Their efficiency is low

They produce direct currents

They can be setup in remote areas.

Q21. What is the main difference between AC and DC generator?

AC Generator has electromagnet but DC has permanent magnet

AC generator generates higher voltage

DC generator generates higher ‘voltage

AC generator has slip rings while DC generator has split rings.

Q22. What is the main cause of acid rain?

Light pollution

Water pollution

Air pollution

Land pollution.

Q23. What is the magnitude of the positive charge of the nucleus?

Greater than charge of the electron

Less than charge of the electron

Integral multiple of charge of an e–

Equal to charge of an e–

Q24. What is the magnitude of charge of a proton?

1.602 × 1020 C

1.602 × 10–20 C

1.602 × 10–19 C

1.602 × 1010 C

Q25. What is the magnitude of the force, when a current conductor is placed perpendicular to the direction of magnetic field?

Maximum

Zero

Minimum

One unit

Q26. What is the magnetic flux linked with a coil of area 0.7cm2 placed at right angle to the magnetic field of induction 0.2 tesla?

1.4 × 10–6 wb

14 × 10–5 wb

1.4 × 10–5 wb

1.4 × 10–4 wb

Q27. What is the magnetic flux linked with a coil of area 0.7 cm2 placed at right angle to a magnetic field of induction 2 tesla?

14 × 10–5 W

5 × 10–2 W

14 × 105 W

15 × 10–6 W

Q28. What is the initial velocity when an object is dropped from certain height?

4.9 m/s

9.8 m/s

6.4 m/s

zero.

Q29. What is the magnetic field at the centre of a circular coil . of radius r through which a current I flows?

Directly proportional to r

Inversely proportional to I

Directly proportional to l2

Directly proportional to I

Q30. What is the inertia of football and stone of same size?

Football is greater

Both are equal

Stone is greater

None of the above.

Q31. What is the heat capacity of 70 g of water in J 1 degree C having the specific heat capacity of 4.2 J (g degree C). [Heat capacity = Specific heat capacity × mass]

147

588

294

280

Q32. What is the half-life period of 6C14?

11200 years

5600 seconds

2800 years

5600 years

Q33. What is the function of the commutator or slip ring?

To increase the flow of current

To decrease the flow of current

To change the direction of current

To change the direction of magnetic field.

Q34. What is the function of the carbon brushes in a DC motor

Clean the moving surface

Change the probity of the contact

Increase the strength of current

Make a connection with the moving surface

Q35. What is the function of a reflector in a solar cooker?

Decrease temperature inside solar cooker

Increase temperature inside solar cooker

Reflect back the solar energy into atmosphere

Increase temperature around the solar cooker.

Q36. What is the function of a live wire?

To bring in the current

Provide the return path for the current

Bring the current in and also provide the return path for current flow

Block the path for current flow.

Q37. What is the frequency range of FM band?

88KHz to 108 MHz

550 KHz to 1600 KHz

88 MHz to 108 MHz

550 MHz to 1600 MHz

Q38. What is the frequency of a wave of wavelength 150 m

2 kHz

20 MHz

2 MHz

30 KHz

Q39. What is the formula for nuclear radius?

Q40. What is the expression for work function having yO threshold frequency?

W = h/g0

W = g0/h

W = h g0

W = h (g – g0)

Q41. What is the force required to produce an acceleration 5 m/s2, on object of mass 14 kg?

19 N

70 N

30 N

1.6 N

Q42. What is the expression for half life period?

Q43. What is the expression for de Broglie wave length?

l = h/v

l = mv/h

l = h/mv

l = h/2pmv

Q44. What is the equivalent resistance of three equal resistors of 6W when connected in parallel?

18 W

0.5 W

2 W

12 W

Q45. What is the equation of velocity of EM wave as derived by Maxwell?

Q46. What is the energy of the photon according to quantum theory?

E = Mc2

E = 1/2 mu2

E = h g

E = h g – h g0

Q47. What is the equation of projectile motion?

y = kx2

x = ky2

y = K/x2

Y = kx.

Q48. What is the emf of a normal dry cell?

2 V

1 V

1.5 V

3 V

Q49. What is the distance of near point of a human eye?

10 cm

20 cm

25 cm

Q50. What is the disadvantage of using fossil fuel

They leave no residue

Calorific value is less

Causes green house effect

They need low ignition temperature.

Answers Evaluate

WEBSITE AND DATABASE FOR SALE

Browse by Chapter