MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
Quiz
General Knowledge
Physics
Quiz 23
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Q.1
Mach number is used in connection with the speed of
sound
aircraft
spacecraft
ships
Q.2
Identify the vector quantity from the following
Heat
Angular momentum
Time
Work
Q.3
Isotopes of an element contain
the same number of protons but different number of neutrons
the same number of neutrons but different number of protons
equal number of protons and electrons
equal number of nucleons
Q.4
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
1.8 km, 0.15 km
2.2 km, 0.20 km
2.8 km, 0.25 km
3.3 km, 0.30 km
Q.5
Intensity of sound at a point is ____ its distance from the source.
directly proportional to
inversely proportional to
directly proportional to square of
inversely proportional to square of
Q.6
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
X-rays
ultraviolet light
visible light
radio waves
Q.7
Out of the following pairs, which one does not have identical dimension?
Moment of inertia and moment of a force
Work and Torque
Angular momentum and Planck's constant
Impulse and Momentum
Q.8
On a stationary sail boat, air is blown from a fan attached to the boat. The boat
moves in opposite direction in which the air is blown
does not move
moves in the same direction in which air blows
spins around
Q.9
Rainbow is due to
absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets
ionisation of water deposits
refraction and reflection of sunlight by water droplets
Q.10
Large astronomical telescopes always use as objective
lens
mirror
combinations of lenses
None of the above
Q.11
One should not connect a number of electrical appliances to the same power socket because
this can damage the appliances due to overloading
this can damage the domestic wiring due to overloading
this can damage the electrical meter
the appliance will not get full voltage
Q.12
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
Scattering
Diffraction
Interference
Polarization
Q.13
Sound travels at the fastest speed in
steel
water
air
vacuum
Q.14
Oil raise up the wick in a lamp. The principle involves
the diffusion of oil through the wick
the liquid state of oil
capillary action phenomenon
volatility of oil
Q.15
Sound of frequency below 20 Hz is called
audio sounds
infrasonic
ultrasonic
supersonics
Q.16
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:
mercury is a metal.
density of mercury is greater than that of water.
cohesion of mercury is greater than its adhesion with glass.
cohesion of water is greater than its adhesion with glass.
Q.17
Inside an aeroplane, flying at a high altitude,
the pressure is the same as that outside.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.
normal humidity and partial vacuum are maintained.
Q.18
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
Water, iron and air
Iron, air and water
Air, water and iron
Iron, water and air
Q.19
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
at sea level
at the top of Mt. Everest
at a place in a valley below sea level
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
Q.20
Radio telescopes are better than optical telescopes because
they can detect faint galaxies which no optical telescope can
they can work even in cloudy conditions
they can work during the day and night
All of the above
Q.21
Mercury is commonly used as a thermometric fluid rather than water because
specific heat of mercury is less than water
specific heat of mercury is more than water
mercury has greater visibility than water
density of mercury is more than the water
Q.22
Optical fibre works on the
principle of refraction
total internal reflection
scattering
interference
Q.23
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
4.2 seconds
42 seconds
4.2 years
42 years
Q.24
The fuse in our domestic electric circuit melts when there is a high rise in
Inductance
Current
Resistance
Capacitance
Q.25
Stars which appear single to the naked eye but are double when seen through a telescope are
novas and supernovas
binaries
asteroids
quasars
Q.26
Lux is the SI unit of
intensity of illumination
luminous efficiency
luminous flux
luminous intensity
Q.27
On a rainy day, small oil films on water show brilliant colours. This is due to
dispersion
interference
diffraction
polarization
Q.28
Sound waves in air are
transverse
longitudinal
electromagnetic
polarised
Q.29
Magnetism at the centre of a bar magnet is
minimum
maximum
zero
minimum or maximum
Q.30
Superconductors are substances which
conduct electricity at low temperature
offer high resistance to the flow of current
offer no resistance to the flow of electricity
conduct electricity at high temperatures
Q.31
Light travels at the fastest speed in:
glass
water
hydrogen
vacuum
Q.32
Railway tracks are banked on curves
necessary centrifugal force may be obtained from the horizontal component weight of the train
to avoid frictional force between the tracks and wheels
necessary centripetal force may be obtained from the horizontal component of the weight of the train
the train may not fly off in the opposite direction
Q.33
Suitable impurities are added to a semiconductor depending on its use. This is done in order to
increase its life
enable it to withstand higher voltages
increase its electrical conductivity
increase its electrical resistivity
Q.34
Stars twinkle because
the intensity of light emitted by them changes with time.
the distance of the stars from the earth changes with time.
the refractive index of the different layers of the earth's atmosphere changes continuously.
None of these
Q.35
Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
Pressure and Young's modules
Planck's constant and Angular momentum
Impulse and moment of force
Force and rate of change of linear momentum
Q.36
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same:
Velocity
Momentum
Acceleration
Kinetic energy
Q.37
One thousand microns is equal to
10
-3
m
10
-6
m
10
-9
m
10
-12
m
Q.38
Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
Move towards A
Move towards B
Move at right angles to the line joining A and B
Remain at rest
Q.39
Materials for rain-proof coats and tents owe their water-proof properties to
surface tension
viscosity
specific gravity
elasticity
Q.40
It is more difficult to walk on a sandy road than on a concrete road because
sand is soft and concreter is hard.
the friction between sand and feet is less than that between concrete and feet.
the friction between sand and feet is more than that between concrete and feet.
the sand is grainy but concrete is smooth.
Q.41
Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
0.14 m/s
140 m/s
1.4 km/s
14 m/s
Q.42
It takes much longer to cook food in the hills than in the plains, because
in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100
o
C causing an increase in cooking time
due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100
o
C and therefore water takes longer to boil
in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
Q.43
Pick out the scalar quantity
Force
Pressure
Velocity
Acceleration
Q.44
An object having the capability to do work is said to possess
Inertia
Force
Pressure
Energy
Q.45
Rectifiers are used to convert:
Direct current to Alternating current
Alternating current to Direct current
High voltage to low voltage
Low voltage to high voltage
Q.46
Energy per unit volume is dimensionally equal to
Pressure
Force
Density
Work
Q.47
To open a door easily, the handle should be fixed
Near the hinges
Away from mid-point opposite to hinges
In the middle
None of these
Q.48
The wall of a dam is broader at the base
Because streamlining is required
To withstand pressure that increases with depth
To withstand pressure that increases in a horizontal plane
To withstand pressure that is increased with atmospheric pressure
Q.49
It is easy to burst a gas-filled balloon with a needle than with a nail. It is because
Nail is more longer than needle.
Nail exerts more pressure than needle on the balloon.
Needle exerts more pressure than nail on the balloon.
Gas is reactive with the needle.
Q.50
The rotational effect of a force on a body about an axis of rotation is described in terms of
Centre of gravity
Centripetal force
Centrifugal force
Moment of force
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page