General Science
Physics
Some Important General
Knowledge questions on History, Geography, General
Science, Indian Constitution and Polity, Important
Dates ,Current affairs, Greatest ,Largest, Smallest for various
competitive examination in West Bengal such as WBSSC, PSC,Group "C",
Group "D" exams.
1.
Who discovered that the free fall acceleration is the same for any object at a
given place?
(A)Archimedes
(B) Newton (c) Galileo (D) Pascal
2.
Which Physical quantity is measured in Watts?
(A)
Momentum (B) power (C) impulse (D) Kinetic
3.
A bullet is fired at a certain angle with the horizontal. Its path will be
(A)
A vertical line (B) Elliptical (C) A straight line (D) a parabola
4.
According to the General Conference on weights and measures the unit of length
is
(a)
a kilometer (b) an inch (c) a centimeter (d) a meter
5.
It is easier to pull aq road-roller than to push it along
(a)
False (b) True
6.
Choose the scalar quantity from the following physical quantities.
(a)
Acceleration (b) force (c) speed (d) velocity
7.
A man jumping out of a moving train is thrown
(A)
Backward (b) sideways (c) forward (d) none of the above
8.
If the momentum of a body increases by 20% by how much percent does its kinetic
energy increase?
(a)
36% (b) 40% (c) 48% (d) 44%
9.
Watt is
(a) A unit of power (b) a unit of energy (c) a
unit of work (d)a unit of force
10.
The centre of gravity of a triangular lamina is its
(a)
circum-centre (b) centroid (c) ortho-centre (d) in-centre
11.
When a swing is drawn to a side its potential energy in relation to the earth –
(a)
Decreases (b) increases (c) is constant (d) remains the same
12.
If you want to open a door with less difficulty you push it
(a)
At a point away the hinge (near the rim) (b) near the hinge (c) at the middle
13.
The working of a physical balance depends on the principle of moments
(a)
False (b) True
14.
One horse power is equal to
(a)
816 watts (b) 520 watts (c) 625 watts (d) 746 watts
15.
A body from a height for 5 seconds. Its velocity then is-
(a)
49 m/s2 (b) 49 m/s (c) 4.9 m/s2 (d) 4.9 m/s
16.
A body is given initial velocity and is allowed to move under the action of
gravity the path of the article will be-
(a)
An ellipse (b) a parabola (c) a straight line (d) a circle
17.
When a body is taken to the pole from the equator, its weight becomes-
(a)
Less (b) the same (c) greater
18.
The force that keeps a body in a circular motion is called-
(a)
The centrifugal force (b) the frictional force (c) the centripetal force
19.
The unit of power in S.I. is-
(a)
Erg/sec (b) Joule/sec (c) Joule (d) Newton
20.
If the speed of rotation of the earth increases the weight of a body-
(a)
will have no change (c) will increase or decrease (c) will increase (d) will
decrease
21.
The period of oscillation of a simple pendulum depends upon-
(a) Acceleration due to the gravity at the site
of experiment (b) the amplitude of vibration (c) the material of the bob (d)
the mass of its bob
22.
Momentum is the product of mass and acceleration
(a)
False (b) True
23.
Where does the C.G. of a rubber ring lei?
(a)
in the inner surface (b) a the centre of the ring (c) on the outer surface (d)
none of the above.
24.
A ball lying on the ground is in neutral equilibrium
(a)
False (b) True
25.
From Newton’s First law of motion we can define
(a)
acceleration (b) momentum (c) velocity (d) force
ANSWERS: 1. C 2. B 3.
D 4. D 5. B 6. C 7. C
8. D 9. A 10. B 11. B 12.
A 13. B 14. D 15. B
16. B 17. C 18. C 19. B 20. D 21. C 22. A 23. B 24. B 25. D
26.
The sun continuously produces an enormous amount of energy. This is due to
(a)
bailing (b) chemical combustion (c) nuclear fusion (d) nuclear fission
27.
A body acted on by an unbalanced force of 10N accelerates 0.5m/sec2. The
mass of the body is –
(a)
20kg(b) 10kg (c) 5kg (d) 2kg
28.
When work is done by a force on the body, the body acquires energy
(a)
False (b) True
29.
The centre of gravity of a body may lie-
(a)
inside the body (b) on the body itself (c) outside the body (d) all the above.
30.
The efficiency of a machine is 60%. If the output is 720 J what is the input?
(a)4.32J
(b) 800 J (c) 1200 J (d)1000 J
31.
On applying a constant force to a mass, it moves with a uniform
(a)
Momentum (b) angular velocity (c) velocity (d) acceleration
32.
Frictional force acts in
(a)
the opposite direction of the motion. (b) the same direction of the motion (c)
all the direction
33. A bucket of water weighing 20kg is lifted to
a height of 10 meters 5 seconds. If g=9.8 ms2 the power developed
is-
(a)
980w (b) 200 w (c) 100w (d) 392w
34.
The distance between two bodies is halved. Now the force of attraction between
them will be -
(a)one
forth (b)two times (c) half (d) four times
35.
An astronomical unit of distance is-
(a)
light year (b) the average distance from the earth to the sun (c)a
kilometer (d) none of the above.
36.
An angular angular velocity of 600 rpm is the same as-
(a)
60 radians/sec. (b) 2π
radian/sec (c) ½n radian/sec (d) 20n radians/sec
37.
The motion of the pendulum of a wall clock is an example of-
(a)
Rotational motion (b) vibratory motion (c) linear motions (d) none of the
above.
38.
In which of the following will a piece of iron weigh most?
(a)
in an atmosphere of oxygen (b) in air (c) in vacuum (d) in an atmosphere of CO2.
39.
The theory that the earth constituted the centre of the universe around which
the sun, and the planets revolved was propounded by-
(a)
Newton (b) Copernicus (c) Kepler (d) Ptolemy
40.
The attraction between similar molecules is called
(a)
friction (b) cohesion (c) adhesion (d)
inertia
41.
The barometer was invented by-
(a)
Thomas Alba Edison (b) Benjamin Franklin (c) Torricelli (d) Michael Faraday.
42.The
lift of an aeroplane is based on-
(a)
law of gravitation (b) Bernoulli’s principle (c) invert square law (d)
Torricelli’s theorem
43.
The surface tension of a liquid is measured in –
(a)
Newton’s per sq. meter (b) Newton’s per meter (c) kilograms per sq. meter (d)
dynes per sq. cm.
44.
Oil rises in the wick of a lamp through capillary action.
(a)
False (b) True
45.
The earth satellite Aryabhatta as put in orbit by India on
(a)
April 19, 1975 (b) January 26, 1979 (c) October 20, 1978 (d) November 14, 1976
46.
When water is cooled from 40 C to 20C its
density-
(a)
Remains the same (b) increases (c) decreases
47.
The density of water in the S.I. system is-
(a)
10-2 kgem-3 (b) 10-4 kgem-3 (c) 103 kgem3 (d) 102
kgem3
48.
A ship in sailing from a river to the sea
(a)
Sinks more (b) sinks less (c) neither sinks more nor less
49.
The weight of a piece of cork in 20g. What volume of the cork is immersed when
it floats in
(a)
4 cm2 (b) 20 cm3
(c) 40 cm3 (d) 80 cm3
50.
If the metacentric height of a ship increases the stability of the ship-
(a)
first increases and then decreases (b)
increases (c) decreases (d) remains
unaffected
26.
C 27. A 28. B 29. D
30. C 31. D 32. A 33. D 34. D 35. A 36. D 37. B 38. C 39. D 40. B 41. C 42. B 43.
A 44. B 45. A 46. C 47. C 48. B 49. B 50. B
51. A boat gets most easily rocked it it is -
(a) narrow and light (b) narrow and heavy (c) broad
and light (d) broad and heavy
52. The aneroid barometer uses
(a) alcohol (b) distilled water (c) mercury (d)
does not uses any liquid
53. A sudden fall in the level of mercury in a
barometer indicates
(a) calm weather (b) cold and dry weather (c)stormy
weather (d) hot sunny weather
54. In a storm the roofs of some houses are carried
away. This is in accordance with
(a) Law of Inertia (b) Pascal's law (c) Archimedes
principle (d) Bernoulli's theorem
55. Powder clings to the skin because of-
(a) absorption (b) capillary action (c) adhesion (d)
cohesion
56. The instrument used to determine the R.D. of a
liquid by the principle of flotation is
(a) Hypsometer (b)Hydrometer (c) Hygrometer
57. The hydraulic jack to lift vehicles in automobile
service station is one of the applications of-
(a) Boyle's law (b) Hook's law (c) Pascal's law
(d) Principle of Archimedes
58.The attraction of unlike molecules at the common
service is known as -
(a) capillarity (b) surface tension (c) cohesion (d)
adhesion
59. The period of a geostationary satellite orbiting
the earth over the equator is
(a) 12 hours (b) 24 hours (c) 16 hours (d) 20 hours.
60. The minimum velocity of a satellite projected from
the surface of the earth is independent of-
(a) 35km/s (b) 21 km/s (c) 11.2 km/s (d) 18 km/s.
61. The Escape velocity of a satellite projected from
the surface of the earth is independent of
(a) the radius of the earth (b) the mass of the earth
(c) the mass of the satellite.
62.If M is the mass of the substance, V its volume and
D its density, then find out which is wrong-
(a) 1/D=M/V (b) D= M/V (c) M=VD (d) V=M/D
63. When ice melts its volume-
(a) remains the same untill all the has melted and
then increases (b) remains the same (c) decreases (d) increases
64. What volume does 680 g of mercury occupy if density
of mercury is 13600 kgm3-
(a)200cm3 (b) 50 cm3 (c) 500 cm3
(d) 20 cm3
65. The S.I. Unit of pressure is-
(a) Dyne (b) Watt (c) Pascal (d) Jule
66. A pressure gauge of
fluids is called
(a) Lactometer (b) an
anemometer (c) a manometer (d) a hydrometer.
67. When a small hollow
spherical ball of rubber is lowered into a vessel of water
(a) It will become flat (b)
It will burst (c) it will retain i8ts spherical shape.
68. The height of a water
barometer at a place where atmospheric pressure is 30 inches of mercury is-
(a) 32 feet (b) 30 feet (c) 40.8 feet (d) 34 feet
69. Meniscus of mercury in a
capillary tube is convex –
(a) False (b) True
70. Rain drops are spherical
in shape because of –
(a) surface tension (b)
viscosity (c) atmospheric pressure (d) elasticity.
71. In compact porous soal, the
water rises and evaporates. The rising of the water is due to –
(a) Cohesion (b) adhesion
(c) capillarity
72. The total energy at
different points in an ideal liquid undergoing streamline flow, remains
unchaged. This was propounded by
(a) Boyle (b) Bernoulli (c) Archimedes
(d) Charles
73. Bernoulli’s theorem is
involved in the working of
(a) Bunsen Burner (B) Carburetor
(c) Atomizer (d) all the above.
74. A man stands on the pan
of a balance holding a fish in his right hand and bucket of water in his left
hand. If he transfers the fish into the bucket, the total weight on the pan-
(a) remains the same (b)
first increases and then decreases (c) increases (d) decreases
75. Which of the following
are necessary for a double Decker bus to have stability?
(i) a broad base (ii) more
passengers on the lower deck (iii) more passengers on the upper deck
(a) II only (b) III only (c) I and II only (d) I and III only
51.A 52. d 53. c 54. d
55. c 56. b 57. c 58. d 59. b 60. c 61. c 62. a 63.
c 64. b 65. c
66. C 67. C 68. D 69. B 70. A 71. C 72. B 73. D 74. A 75. C
66. C 67. C 68. D 69. B 70. A 71. C 72. B 73. D 74. A 75. C
76.In a Liquid , pressure at
different depths from the free surface are different.
(a) False (b) True
77. A balloon filled with
hydrogen –
(a) Will reach a particular
height and remain floating (b) will burst after reaching some height (c) will
continue going upwards uninterrupted.
78. A Device used to measure
heights above sea level is known as –
(a) Dilatometer (b)
potentiometer (c) altimeter (d) anemometer
79. The mixing up of two
gases as a result of random motion of molecules is called –
(a) Vaporization (b)
sublimation (c) effusion (d) diffusion
80. Escape velocity of an
object is the velocity-
(a) Of bats in flight in the
night (b) of a supersonic aircraft (c) equal to that of light (d) required to
overcome a particular gravitational field
81. When the velocity of a
moving object is doubled its –
(a) potential energy gets
doubled (b) kenetic energy gets doubled (c) momentum gets doubled (d)
acceleration gets doubled.
82. In a vacuum the
following three articles ( a feather, a stone , a piece of wood) are dropped at
the same time from the same height. Which will reach the ground quicker?
(a) feather (b) a stone (c)
all will reach at he ground at the same time (d) a piece of wood
83. The principle on which a
jet engine works is –
(a) Newton’s law of action
and reaction (b) Conservation of angular momentum (c) conservation of mass (d)
none of the above
84. A rocket moves according
to the principle of conservation of
(a) energy (b) mass (c)
momentum (d) force
85. The person who suggested
that the earth is magnetized is
(a) Wilhelm Weber (b) Dr.
William Gilbert (c) Robert Norman
86. The speed of sound is
the highest in
(a) humid air at 300
c (b) humid air at 00 c (c) dry air at 300 c (d) dry air
at 00 c
87. for a given frequency
the loudness is related to-
(a) Speed (b) Wavelength (c)
amplitude (d) none
88. Electromagnets are used
in
(a) the electric bell (b)
the telephone ear piece (c) the telegraph (d) all the above
89. Which sounds of the
following frequencies we cannot hear?
(a) 15,000 Hz (b) 1, 20,000
Hz (C) 1000 Hz (d) 100 Hz
90. In a ship depth of the
sea is measured by
(a) a sonometer (b) a
hydrometer (c) a fathometer (d) an altimeter
91. Apart from the iron
another common element which is attracted strongly by a magnet is
(a) nickel (b) brass (c)
glass (d) copper
92. Which is the non
magnetic element-?
(a) Cobalt (b) Nickel (c)copper
(d) Iron
93. Under similar conditions
of temperature and pressure, the velocity of sound is maximum in –
(a) Oxygen (b) hydrogen (c)
argon (d) helium
94. Sound travel fastest in –
(a) water (b) vacuum (c) air
(d) iron
95. The Device is used to record sound –
(a ) a phonograph (b) an
amplifier (c) a headphone (d) a microphone
96. A speed greater than that of sound is known as
supersonic speed.
(a) False (b) True
97. Echoes are produced by –
(a) the refraction of sound
waves (b) reverberation of sound waves (c) the reflection of sound waves (d)
the interference of sound waves
98. Ultrasonic waves are
used
(a) in testing the quality
of the timings and pads used in vehicles and aircraft brakes (b) to clean
surgical instruments, jewelry and similar articles (c) in medical and surgical
diagnosis (d) all the above.
99. The audible range of a
normal human ears frequencies ranging from-
(a) 15 - 50,000 Hz (b) 20 –
20,000 Hz (c) 50 – 15,000 Hz (d) 10,000 – 20,000 Hz
100. Speed of sound in air
at 00 is approximately
(a) 500 m/s (B) 330 m/s (c)
1500 m/s (d) 3×108 m/s
Print 
PDF