Physics Quiz for SSC CGL Exams Set - 1
1. The time period of a pendulum depends on
(a) the mass
(b) the length
(c) the time
(d) both (a) and (b)
2. Scent sprayer is based on
(a) Charles’s law
(b) Boyle’s law
(c) Archimedes’ principle
(d) Bernoulli’s principle
(a) By passing it through a prism
(b) By filteration
(c) Can’t be separated
(d) Both (a) and (b)
4. Cooling is not done by
(a) flow of water
(b) release of compressed gas
(c) burning cooking gas
(d) melting the solid
5. At which temperature the centigrade and
Fahrenheit scales are equal?
(a) 40°
(b) – 40°
(c) 37°
(d) 94.6°
6. The magnetic needle always points in _______
direction.
(a) East – West
(b) West – South
(c) North – South
(d) North – East
7. Who was the inventor of Radar ?
(a) Robert Watson
(b) Fleming
(c) Bush Wall
(d) Austin
8. Which of the following instruments measures blood
pressure?
(a) Spherometer
(b) Stethoscope
(c) Sphygmomanometer
(d) Ammeter
9. Retina of the eye is comparable to which of the
following parts of a traditional camera ?
(a) Film
(b) Lens
(c) Shutter
(d) Cover
10. Refrigeration helps in food preservation by
(a) killing the germs
(b) reducing the rate of biochemical
reactions
(c) destroying enzyme action
(d) sealing the food with a layer of
ice
11. The filament of an electric bulb is made of
(a) copper
(b) aluminium
(c) lead
(d) tungsten
12. Which mirror is used as a rear view mirror in
the vehicles ?
(a) Plane
(b) Convex
(c) Concave
(d) Plano concave
13. The reason of mirage is
(a) interference of light
(b) diffraction of light
(c) polarisation of light
(d) total internal reflection of
light
14. The colour of light is determined by its
(a) amplitude
(b) wavelength
(c) intensity
(d) velocity
15. Ultrasonics are sound waves of frequency
(a) greater than 20,000 Hz
(b) less than 10,000 Hz
(c) equal to 1000 Hz
(d) None of these
16. Laser is a device for producing
(a) spontaneous radiation
(b) dispersed radiation
(c) scattered radiation
(d) stimulated radiation
17. MRI stands for ?
(a) Magnetic Record of Intestines
(b) Magnetic Recording of
Investigations
(c) Magnetic Resonance Imaging
(d) Magnetic Resonance in Intestines
18. When ice melts, then the
(a) volume increases
(b) volume decreases
(c) mass increases
(d) mass decreases
19. What type of electromagnetic radiation is used
in the remote control of a television ?
(a) Infrared
(b) Ultraviolet
(c) Visible
(d) None of these
20. A 100 watt bulb is kept switched ON for four
hours. The units of electrical energy consumed is
(a) 400 unit
(b) 25 unit
(c) 4 unit
(d) 0.4 unit
Answers with Explanations:
1. (b) Time
period T = 2П √(l/g) The time period of a pendulum depends on its length l and
acceleration due to gravity g.
2. (d)
Scent sprayer is based on Bernoulli’s principle.
3. (a) When a white ray of light passes through a prism it breaks into 7
colours VIBGYOR.
4. (c)
While compressed gas is released by absorbing surroundings heat or temperature
lowers the temperature of surrounding. Hence, causes cooling.
5. (b)
6. (c) The
magnetic needle always points North-South direction. Magnetic north towards
geographic south and magnetic south pole towards geographic north pole.
7. (a) Robert Watson was the inventor of
Radar.
8. (c) The
instrument Sphygmomanometer measures the blood pressure.
9. (a)
Retina of the eye is comparable to the film of a traditional camera. Retina is
a film of nerve fibres. Image of the object is formed at retina just like
camera film is used to see the images.
10. (b)
Refrigeration lowers the temperature which helps in food preservation by
reducing the rate of bio-chemical reactions.
11. (d) Electric
bulb filament is made of tungsten.
12. (b) Convex
mirror is a diverging mirror used as a rear view mirror in the vehicles as it
covers wide range of vehicles coming behind.
13. (d) Mirage
is an optical illusion. The reason of mirage is total internal reflection of
light. In summer air near the ground is hotter and hence rarer than the air
above which is responsible for TIR, hence, mirage.
14. (b) The
colour of light is determined by its wavelength. Among seven constituent
colours VIBGYOR wavelength of red light is maximum and of violet light is
minimum.
15. (a) Ultrasonics
are sound waves of frequency greater than 20,000Hz. The frequency range 20Hz to
20,000Hz is human audible range of frequency.
16. (d) Laser
is a device for producing stimulated radiation. LASER stands for light
amplification by stimulated emission of (electromagnetic) radiation.
17. (c) MRI
stands for magnetic resonance imaging.
18. (b) When
ice melts, density increases so volume decreases.
Mass = volume × density
19. (a) Infrared
is used in the remote control of a television.
20. (d)
