25 questions on “Physics GK Mock Test” objective questions series – malleable, atmospheric refraction, escape velocity, frequency and time period, speed of sound, tangent galvanometer coil, resistance, nichrome, E=mc2, cathode rays, alloy in heating elements, electric bulb filament, uranium nuclear power, angular momentum, mars, earth’s twin, equatorial and polar circumference, relative humidity etc.

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Question Section:

Que (51): Which is the most malleable metal?
A. Copper
B. Iron
C. Gold
D. Siver

Answer: C. Gold,
Gold and pure platinum is most malleable metal, that can be hit or pressed into shape easily without breaking or cracking. GOld is also the most ductile metal as well i.e. it can be drawn into thin wires.

Que (52): The altitudes of heavenly bodies appear to be greater than they actually are. Why is this?
A. Atmospheric reflection
B. Atmospheric refraction
C. Atmospheric imbalance
D. All of these

Answer: B. Atmospheric refraction,
Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height.

Que (53): If a ship moves from freshwater into seawater, what will happen?
A. It will not raise
B. It will go lower
C. It will raise a little higher
D. There wont be any difference

Answer: C. It will rise a little higher,
It will float a little higher in the sea water as it moves from freshwater into seawater – as seawater is denser because of the dissolved salts.

Que (54): The escape velocity from the surface of the earth does not depend on which body?
A. Gravity of the body
B. Mass of the body
C. Weight of the body
D. None of these

Answer: B. Mass of the body,
It depends on mass and radius of the planet from which it is projected i.e. it’s formula is V = (2GM/R)^1/2, where M and R are mass and radius of the planet from which it is projected.

Que (55): What is the product of the time period of a wave and its frequency?
A. Watt
B. Volt
C. Ampere
D. Unity

Answer: D. Unity,
Frequency is nothing but 1 divided by time period of wave, hence the product of time period and frequency will. beunity.

Que (56): With the rise of temperature, what happens in the speed of sound in a gas?
A. Increases
B. Decreases
C. Stays the same
D. No change

Answer: A. Increases,
With rise in temperatures, molecules in gas will have higher kinetic energy, and as they move faster their collisions occur at greater frequency and they carry sound waves faster.

Que (57): When the radius of the T.G. coil i.e. Tangent Galvanometer Coil is decreased, what does happen in its sensitiveness?
A. Increases
B. Decreases
C. No difference
D. None of these

Answer: A. Increases,
It’s sensitivity is inversely proportional to radius of T.G. coil.

Que (58): The resistance of material increases with temperature. What is this material?
A. Metals
B. Non-metals
C. Conductors
D. Disintegrators

Answer: A. Metal,
Resistance increases, in case of conductor, with increase in temperature and decreases, in case of insulator, due to increase in temperature.

Que (59): Which material is very hard and very ductile?
A. Nickel
B. Silicon
C. Chromium
D. Nichrome

Answer: D. Nichrome.

Que (60): Einstein’s mass energy relation is given by which expression?
A. a^2 + b^2 = c^2
B. E = mc2
C. F = ma
D. S(universe) > 0

Answer: B. E = mc2.

Que (61): Which rays will deflect in electric field?
A. Gamma rays
B. Cathode rays
C. Gold Rays
D. None of these

Answer: B. Cathode rays,
Cathode rays are negatively charged.
Alpha particles are positively charged, beta particles are negatively charged, and gamma radiation is electrically neutral . This means that alpha and beta radiation can be deflected by electric fields , but gamma radiation cannot.

Que (62): The mass-energy relation is the outcome of which theory?
A. Doppler effect
B. Ehrenfest’s theorem
C. Einstein’s general theory of relativity
D. Special theory of relativity

Answer: C. Einstein’s general theory of relativity,
Mass–energy relationship was developed by Einstein in his theory of relativity, E = mc2 expresses the association of mass with every form of energy.

Que (63): If the atmosphere is cooled, it’s capacity for water vapour?
A. Increases
B. Decreases
C. Stays the same
D. None of these

Answer: B. Decreases,
The capacity of the air to hold water vapour increases as the temperature increases and vice versa. Hence, the correct answer id B.

Que (64): Which alloy used in making heating elements for electric heating devices?
A. Aluminium
B. Bismuth
C. Chromium
D. Nichrome

Answer: D. Nichrome,
Nichrome is an alloy of nickel and chromium, and sometimes iron as well.

Que (65): The filament of an electric bulb is made of which metal?
A. Magnesium
B. Bronze
C. Copper
D. Tungsten

Answer: D. Tungsten,
Tungsten has high melting point, ability to withstand higher temperatures and high resistivity, hence it is used in filament of. anelectirc bulb.

Que (66): Which metal is used for generation of Nuclear Power?
A. Chromium
B. Uranium
C. Plutonium
D. None of these

Answer: B. Uranium,
Uranium is the fuel most widely used to produce nuclear energy. It’s atoms are easily easily split apart and that is why it is used nuclear power plants as fuel.

Que (67): On which conservation law, does a rocker work?
A. Gravity
B. Mass of the rocker
C. Angular momentum
D. Oscillation of the rocker

Answer: C. Angular momentum
In physics, angular momentum is the rotational equivalent of linear momentum. It is an important quantity in physics because it is a conserved quantity.

Que (68): Which is the best conductor of electricity?
A. Iron
B. Copper
C. Gold
D. Silver

Answer: D. Silver,
It is the best conductor of electricity as it has free electrons to transfer electric energy.

Que (69): Which of the planets is nearest to the earth?
A. Saturn
B. Mars
C. Neptune
D. Venus

Answer: B. Mars.

Que (70): Which planet is known as the Earth’s Twin?
A. Saturn
B. Uranus
C. Neptune
D. Venus

Answer: D. Venus,
Venus is a terrestrial planet and is sometimes called Earth’s “sister planet” because of their similar size, mass, proximity to the Sun, and bulk composition.

Que (71): Through which material does sound travel slowest?
A. Wood
B. Teak
C. Gas
D. Metal

Answer: C. Gas,
Sound travels through solids, slower through liquids and slowest through gases. In solid sound travel the fastest. Hence, from above given options it travels fastest through metal and slowest through Gas.

Que (72): How much the equatorial circumference is greater than the polar circumference? for earth
A. Approximately 60 km
B. Approximately 67 km
C. Approximately 78 km
D. Approximately 84 km

Answer: B. Approximately 67 km,
Polar circumference ~40008 km, and equatorial circumference ~40075 km, a difference of 67 kilometers.

Que (73): What is the distance of the equator from either of the poles?
A. 10,000 km
B. 11,001 km
C. 10,002 km
D. 12,003 km

Answer: C. 10,002 km,
The distance of the equator from either of the poles is ~10,002 km.

Que (74): Which layer of the atmosphere provides ideal conditions for flying of jet aeroplanes?
A. Atmosphere
B. Stratosphere
C. Troposphere
D. All of the above

Answer: B. Stratosphere
The troposphere is the lowest level of Earth’s atmosphere. Above it, however, is the stratosphere, followed by the stratopause and then the mesosphere.

Que (75): If the temperature inside a room is increased, what will happen to the relative humidity?
A. Increase
B. Decrease
C. Stay the same
D. none of these

Answer: B. Decreases,
If the water vapour content stays the same and the temperature drops, the relative humidity increases. If the water vapour content stays the same and the temperature rises, the relative humidity decreases.

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