General Knowledge - Physics
Exam Duration: 45 Mins Total Questions : 30
Which of the following class of forces is different from others?
- (a)
Pulling of a cart
- (b)
Stretching of a coiled spring
- (c)
Kicking of a football
- (d)
Electrical force
Which of the following class of forces is different from
- (a)
Magnetic force
- (b)
Electrical force
- (c)
Gravitational force
- (d)
Stretching of spring
1 dyne is equal to
- (a)
980 g wt
- (b)
\({1\over 1980}\) gm wt
- (c)
980 kg wt
- (d)
none of these
Pascal is the unit for
- (a)
pressure
- (b)
thrust
- (c)
buoyant force
- (d)
none of these
The most commonly used thermometric substance is
- (a)
water
- (b)
alcohol
- (c)
mercury
- (d)
none of these
Calorimeters are generally made of
- (a)
copper
- (b)
brass
- (c)
aluminium
- (d)
zinc
When 1 g of ice melts at 0°C
- (a)
80 cal of heat is liberated
- (b)
80 cal of heat is absorbed
- (c)
no heat is required
- (d)
none of these
If a pendulum is allowed to oscillate into a Jar containing water, its time period will
- (a)
increase
- (b)
decrease
- (c)
remain same
- (d)
none of these
Sound waves cannot pass through
- (a)
a solid-liquid mixture
- (b)
an ideal gas
- (c)
a liquid-gas mixute
- (d)
a perfect vacuum
Sound waves are
- (a)
transverse mechanical waves
- (b)
longitudinal mechanical waves
- (c)
neither (a) nor (b)
- (d)
none of these
Sound travels fastest in
- (a)
water
- (b)
steel
- (c)
air
- (d)
kerosene oil
The laws of reflection are true for
- (a)
the plane mirror only
- (b)
the concave mirror only
- (c)
the convex mirror only
- (d)
all reflecting surfaces
Which of the following is a non-luminous body?
- (a)
Fire
- (b)
Sun
- (c)
Stars
- (d)
Earth
The Technique used to transmit audio signals in television broadcasts is
- (a)
Amplitude Modulation
- (b)
Frequency Modulation
- (c)
Frequency Modulation
- (d)
Time Division Multiplexing
Given below are two statements, one labelled as Assertion (A) and other labeled as Reason (R):
Assertion (A): A diamond sparkles more than a glass imitation cut to the same shape.
Reason (R): The refractive index of diamond is less than that of glass.
In context of the above two statements, which one of the following is correct?
- (a)
Both A and R are true and R is correct explanation of A
- (b)
Both A and R are true and R is not correct explanation of A
- (c)
A is true but R is false
- (d)
A is false but R is true
The variations is temperatures from 0°C to 100°C with respect to time of two liquids P, Q are shown in the graph given below:
Which one of the following statements is correct?
- (a)
During heating, liquid P remained hotter than liquid Q throughout
- (b)
At no point of time during heating did the two liquids have the same temperature
- (c)
P attained the temperature of 100°C faster than Q
- (d)
Q attained the temperature of 100°C faster than P
Domestic electrical wiring is basically a
- (a)
series connection
- (b)
parallel connection
- (c)
combination of series and parallel connections
- (d)
series connection within each room and parallel connection elsewhere
Consider the following statements:
A person in a spaceship located half way between the earth and the sun will notice that the
1. sky is jet black
2. stars do not twinkle
3. temperature outside the spaceship is much higher shan that on the surface of the earth
Of these statements:
- (a)
only 3 is correct
- (b)
1 and 2 are correct
- (c)
1 and 3 are correct
- (d)
1,2 and 3 are correct
The planet mercuty is revolving in an elliptical orbit around the sun as shown in the given figure. The kinetic energy of mercury is greatest at the point labelled
- (a)
A
- (b)
B
- (c)
C
- (d)
D
A boy standing at the point 'O' in the given diagram, throws a ball three times with the same force, but projecting it along different inclinations from the ground. The results of the throws have been plotted in the diagram. Which one of the following is a valid conclusion
- (a)
The larger the initial inclination, the longer the throw
- (b)
The larger the height reached, the longer the throw
- (c)
The larger the height reached, the shorter the throw
- (d)
The larger the initial inclination, the greater the height reached
One Astronomical Unit is the average distance between
- (a)
Earth and the Sun
- (b)
Earth and the Moon
- (c)
Jupiter and the Sun
- (d)
Pluto and the Sun
Match list I (Quantity) with list II (Units) and select the correct answer using the codes given below the lists:
List I | List II | ||
---|---|---|---|
A. | High speed | 1. | Mach |
B. | Wavelengh | 2. | Angstrom |
C. | Pressure | 3. | Pascal |
D. | Energy | 4. | Joule |
- (a)
A B C D 2 1 3 4 - (b)
A B C D 1 2 4 3 - (c)
A B C D 1 2 3 4 - (d)
A B C D 2 1 4 3
Fluorescent tubes are fitted with a choke. The choke coil
- (a)
steps up the line voltage
- (b)
steps down the line voltage·
- (c)
reduces current in the circuit
- (d)
chokes low frequency currents
Who amongst the following was the first to state that the earth was spherical?
- (a)
Aristotle
- (b)
Copernicus
- (c)
Ptolemy
- (d)
Strabo
A radioactive substance has a half-life of four months. Three-fourth of the substance would decay In
- (a)
3 months
- (b)
4 months
- (c)
8 months
- (d)
12 months
The following items consist of two statements, one labeled as 'Assertion (A)' and the other as 'Reason (R)'. You are to examine these two items using the code given below:
Assertion (A): The boiling point of water decreases as the altitude increases.
Reason (R): The atmospheric pressure increases with altitude.
- (a)
Both A and R are true and R is the correct explanation of A
- (b)
Both A and R are true but R is NOT the correct explanation of A
- (c)
A is true but R is false
- (d)
A is false but R is true
Consider the following statements:
1. Steam at 100°C and boiling water at 100°C contain same amount of heat.
2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.
3. In an air-conditiner, heat is extracted from the room-air at the evaporator coils and is rejected out at the condenser coils.
Which of these statements is/are correct?
- (a)
1 and 2
- (b)
2 and 3
- (c)
Only 2
- (d)
Only 3
Assertion (A): In our houses, the current in A.C. electricity line changes direction 60 times per second.
Reason (R): The frequency of alternating voltage supplied is 50 Hz.
- (a)
Both A and R are true and R is the correct explanation of A
- (b)
Both A and R are true but R is not the correct explanation of A
- (c)
A is true but R is false
- (d)
A is false but R is true
Consider the following statements.
1. A geostationary satellite is at an apporiximate height of 10,000 km.
2. FM transmission of music is of very good quality because the atmospheric or man-made noises which are generally frequent variations can do little harm.
Which of the statements given above is/are correct?
- (a)
1 only
- (b)
2 only
- (c)
Both 1 and 2
- (d)
Neither 1 and 2
Four wires of same material and of dimensions as under are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?
- (a)
Wire of 1 m length and 2 mm diameter
- (b)
Wire of 2 m length and 2 mm diameter
- (c)
Wire of 3 m length and 1.5 mm diameter
- (d)
Wire of 1 m length and 1 mm diameter