1. Water drops do not stick to the oily surface
due to
(a) Lack of adhesive force
(b) Surface tension
(c) Cannot mix each
other
(d) Water
is lighter than oil
2. Newton’s first law is also called as
(a) law of
moments
(b) law of inertia
(c) law of
energy
(d)
law of momentum
3. If we want to calculate the pressure of a
liquid at the bottom of vessel, the quantity which is not required to determine
it, is
(a) Height of the liquid column
(b) Surface
area of the bottom of the vessel
(c) Density
of the liquid
(d) Acceleration due to gravity at the bottom of
the vessel
4. The clouds float in the atmosphere because of
their low
(a) Temperature
(b) velocity
(c) Pressure
(d) density
5. Low temperature (cryogenics) find application
in:
(a) Space travel, surgery and magnetic levitation
(b) surgery, magnetic
levitation and telemetry
(c) space travel, surgery and telemetry
(d) space travel, magnetic levitation and telemetry
6. The change of a solid into vapour directly is
called
(a) Vaporization
(b) freezing
(c) melting
(d) sublimation
7. What is the principle by which a cooling system
(Radiator) in a motor car works?
(a) Conduction only
(b) convection
(c) Radiation only
(d) both conduction and radiation
8. Which of the following is the best conductor of
the heat?
(a) Mercury
(b)
silver
(c) leather
(d) benzene
9. in the winter season if we touch two blocks one
of iron and another of wood in the early morning then the block of iron appears
to be more cold because
(a) The temperature of the iron block is less than
that of the wooden block
(b) Iron is a bad conductor of heat in comparison
of the wood
(c) Iron is a bad conductor of heat in comparison
of the wood
(d) The block of iron is heavier than the wood
block
10. Which of the following types is used by
computed tomography employed for visualization of the internal structure of
human body?
(a) X- rays
(b)
sound waves
(c) Magnetic resonance
(d) radio-isotopes
11. When light waves pass from air to glass, the
variables affected are
(a) Wavelength, frequency and velocity
(b) Velocity and frequency
(c) Wavelength and frequency
(d) Wavelength and velocity
12. Which of the following types of glass can cut
of ultraviolet rays?
(a) Soda glass
(b)
Pyrex glass
(c) jena glass
(d) crooks glass
13. Which of the following is used in oven?
(a) X-rays
(b)UV-rays
(c) Microwaves
(d)Radio waves
14. Which one of the following has highest
frequency?
(a) cosmic rays
(b) X-rays
(c) radio waves
(d) microwave
15. Which of the following electromagnetic waves
has the longest wavelength?
(a) Infrared rays
(b)gamma rays
(c) light rays
(d) ultraviolet rays
16. X-rays were discovered by-
(a) Roentgen
(b) Becquere
(c) Curie
(d)
Van lane
17. Doppler effect is independent of
(a) Velocity of source
(b) Velocity of listener
(c) Distance between source and observer
(d) none of these
18. Ultra violet light of sun’s radiation is
prevented from reaching the earth’s atmosphere by the layer of
(a) oxygen
(b) hydrogen
(c) ozone
(d)
helium
19. Optical fibre works on the principle of
(a) Total internal reflection
(b) Refraction
(c) Scattering
(d) interference
20. An air bubble in water will act like a
(a) Convex mirror
(b)
convex lens
(c) Concave
mirror
(d) concave lens
Answer
1.
A
2.
B
3.
B
4.
A
5.
A
6.
D
7.
B
8.
B
9.
B
10. A
11. D
12. D
13. C
14. A
15. A
16. A
17. C
18. C
19. A
20. D
No comments:
Post a Comment