Physics Important Questions

1. Cryogenic engines are used in
a) Submarines
b) Refrigerators
c) Rocket technology
d) Research of superconductors
Ans. C ✔✔✔

2. Which among the following fuels causes minimum pollution
a) Diesel
b) Coal
c) Hydrogen
d) Kerosene
Ans. C ✔✔✔

3. What is used as fuel in cryogenic engine ?
a) Liquid Helium
b) Liquid Nitrogen
c) Liquid Hydrogen and Liquid Oxygen
d) Liquid Methane
Ans. C ✔✔✔

4. A substance called ‘yellow cake’ smuggled at the borders is
a) Unrefined form of Heroine
b) Unrefined form of Coccaine
c) Uranium oxide
d) Unsynthesised Gold
Ans. C ✔✔✔

5. In the field of space technology in 1994, India exhibits its capability of
a) Manufacturing Intermediate Range Ballistic Missiles
b) Satellite formation
c) Secret Missiles
d) Launching Geo – Stationary Satellites
Ans. D✔✔✔

6. A sudden decrease in the barometric pressure indicates
a) a stormy weather
b) a fine weather
c) a wet weather
d) a dry weather
Ans. A ✔✔✔✔

7. The instrument used to measure the radio activity is
a) Geiger counter
b) Radio campass
c) Radio micrometer
d) Radar
Ans. A ✔✔✔

8. As a person moves closer to a plane mirror the size of the image formed by the mirror
a) increases
b) decreases
c) first increases and then decreases
d) remains the same
Ans. D ✔✔✔

9. The instrument used to test the purity of milk is
a) galvanometer
b) calorimeter
c) lactometer
d) palarimeter
Ans. C ✔✔✔

10. The lens used to rectify long sight is
a) cancave lens
b) convex lens
c) plano concave lens
d) plano convex lens
Ans. B ✔✔✔

11. A lift is falling freely after the suspension wire breaks. The weight of a person inside the lift would become
a) zero
b) unchanged
c) doubled
d) halved
Ans. A ✔✔✔

12. Which one of the following is most important reasons for the establishment of the Vikaram Sarabai Space Centre at Thumba ?
a) The sea is near to place in the East, West and South directions
b) It is a place near a city in India, which is nearest to the Geographic Equator
c) It is situated on the Geo – magnetic Equator
d) Outer space near Thumba exhibits queer atmospheric phenomena
Ans. C ✔✔✔

13. Which one of the following substances is non – magnetic?
a) Glass
b) Wood
c) Silver
d) All these
Ans. D ✔✔✔

14. Which of the following electronic devices is used for digital displays in electronic calculators
a) Photo diodes
b) Zener diodes
c) LED’s
d) None of these
Ans. C ✔✔✔

15. Centripetal force needed to keep the moon in its orbit round the earth is provided by
a) Gravitational pull of sun
b) Gravitational pull of earth
c) Rotation about its own axis
d) None of these
Ans. A ✔✔✔

16. The process in which heat is transmitted without the aid of the interventing medium is
a) Conduction
b) Convection
c) radiation
d) None of these
Ans. C ✔✔✔

17. The solar eclipse occurs when
a) The sun, the moon and the earth are not in the same line
b) The moon comes between the sun and the earth
c) The earth comes between the sun and the moon
d) The sun comes between the earth and the moon
Ans. B ✔✔✔

18. The widely used primary cell is
a) Dry cell
b) Leclanche cell
c) Daniel cell
d) Lead – acid accumulator
Ans. A ✔✔✔

19. When the pressure increases, the boiling point rises, the device which uses this principle is
a) Pressure cooker
b) Electric iron
c) Electric heater
d) Manometer
Ans. A ✔✔✔

20. Bats can fly in the dark without hitting anything because
a) they are flying mammals
b) their night vision is good
c) they are guided by ultrasonic waves produced by them
d) of no scientific reason
Ans. C ✔✔✔