Physics Questions and Answers

1. To prevent the magnetic effects the magnetic effects sereanson are made of?
1) Glass
2) Wood
3) Iron
4) Brass
Answer :  3

2. The material suitable for making electromagnets should have?
1) high retentivity and high coercivity
2) low retentivity and low coercivity
3) 1 and 2
4) None of these
Answer :  2

3. Diamagnetism is?
1) An orientation effect
2) Domain effect
3) hysteresis effect
4) A distortion effect
Answer :  4

4. The best method for demagnetisation is
1) dropping the magnet from certain hight
2) Hammering the magnet
3) Heating the magnet
4) Sending alternating currents through the magnet
Answer :  4

5. The angle of dip at a place on the earth gives?
1) The horizontal component of the earth’s magnetic field
2) The location of the geographic meridian
3) The vertical component of the earth’s field
4) None
Answer :  1

6. Thermostat works on the principle of ?
1) On heating metal expands
2) unequal expansions of different metals on heating
3) both 1 and 2
4) None
Answer :  2

7. Which of the following behaves like water between oo c and 4o c?
1) Rubber
2) Glass
3) Salt
4) Mercury
Answer :  1

8. Water is used in car radiators as coolant because of
1) Its density is more
2) High Specific heat
3) High thermal conductivity
4) Free availability
Answer :  2

9. Finger prints are observed by the use of
1) Telescope
2) Microscope
3) Galilean telescope
4) Concave lens
Answer :  2

10. Two plane mirrors are at 450 to each other. If an object is placed between them, then the number of images will be
1) 5
2) 9
3) 7
4) 8
Answer :  3

11. The phenomenon used in optical fibres for transmission of light energy is
1) Total internal reflection
2) Scattering
3) Diffraction
4) Refraction
Answer :  1

12. Rising and setting of the sun appears to be reddish because of
1) Reflection
2) Refraction
3) Total internal reflection
4) Scattering due to dust particle and air molecules
Answer :  4

13. Which is used to detect the existence of submarines
1) RADAR
2) LASER
3) SONAR
4) None
Answer :  3

14. Doppler effect is applicable to
1) Sound waves
2) Light waves
3) Radio waves
4) all the above
Answer :  4

15. In case of stationary waves which one given bellow is correct?
1) Energy is uniformly distributed
2) Energy is maximum at nodes and minimum at antipodes
3) Energy is minimum at nodes and maximum at antipodes
4) None of the above
Answer :  3

16. Kilo watt hour is the unit of
1) Power
2) Energy
3) pressure
4) Time
Answer :  2

17. I Fermi is equal to
1) 10-7 micron
2) 10-5 angstrom unit
3) 10-3 nanometre
4) None of the above
Answer :  2

18. Which of the following is not a physical quantity
1) Siemens
2) Kelvin
3) heronry
4) All the above
Answer :  4

19. which of the following is systematic error
1) least count error
2) parallax error
3) Theoretical error
4) All
Answer :  4

20. The arithmetic mean of several measurement is called?
1) Practical value
2) Imaginary value
3) true value
4) Ideal value
Answer :  3

21. Bozeman constant and planck’s constant differ in the dimensions of
1) Mass and time
2) Length and time
3) Length and mass
4) Time and temperature
Answer :  4