Physics GK Mock Test – 9

25 questions on “Physics GK Mock Test” objective questions series.

This article is important for anyone who is preparing for civil services, Bank PO exam or other government exams as such questions have been asked in all these exams in general studies or general knowledge section.

Question Section:

Que (201): Which instrument used to measure the force and velocity of the wind?
A. Barometer
B. Accelerometer
C. Dynamometer
D. Anemometer

Ans: Anemometer is the instrument used to measure the force and velocity of the wind.

Que (202): What is most suitable for the core of an electromagnet?
A. Iron
B. Soft iron
C. Steel
D. Stainless steel

Ans: Soft iron
Soft iron possesses a characteristic known as high magnetic permeability, which renders it capable of swift magnetization and demagnetization when subjected to fluctuations in the current flowing through the coil.

Que (203): A convex mirror makes a good rear-view mirror for a car. Why?
A. It forms erect, reduced images
B. It forms horizontal, reduced images
C. It forms erect, increased images
D. It forms vertical, reduced images

Ans: It forms erect, reduced images,
Also it allows for a larger area to be visible in the mirror.

Que (204): For the measurement of temperature of the order of 400°C, what will we prefer?
A. Thermometer
B. Thermocouple
C. Thermostat
D. none of these

Ans: Thermocouple,
Thermocouples function as temperature sensors by utilizing the Seebeck effect, a phenomenon where a voltage is produced in proportion to the temperature disparity between two junctions composed of distinct metals.

Que (205): When lake starts freezing the formation of the ice will start first at which point?
A. Top
B. Bottom
C. Between
D. Sides

Ans: Top.

Que (206): By whom was the principle of ‘Black hole’ enunciated?
A. Hawkings
B. Lieber
C. Charles
D. S. Chandrashekhar

Ans: S. Chandrashekhar,
Chandrasekhar’s work was a significant contribution to our understanding of stellar evolution and the conditions under which black holes might form.

Que (207): If the current in the core decreases, what will the strength of the magnetic field be?
A. Increases
B. Decreases
C. Constant
D. No change

Ans: Decreases,
The intensity of the magnetic field produced by an electromagnet is in direct correlation with the current traversing its coils. Consequently, if the current within the core diminishes, the potency of the magnetic field will correspondingly decline.

Que (208): What is the commonly used unit for measuring the speed of data transmission?
A. Bits per second
B. Bits per mili second
C. Bits per minute
D. Bits per micro second

Ans: Bits per second.

Que (209): Which pairs of rays is electromagnetic in nature?
A. X rays
B. Gamma Rays
C. EV Rays
D. A and B

Ans: x-rays and gamma rays.

Que (210): Mercury thermometers can be used to measure temperature up to how many °C?
A. 360°C
B. 361°C
C. 365°C
D. 362°C

Ans: 360°C,

Mercury thermometers are typically used to measure temperatures within the range of approximately -38°C to 356°C.

Que (211): If the temperature of a body is 50°C. What is the temperature on Kelvin scale?
A. 323.15 K
B. 323.20 K
C. 323.30 K
D. 323.35 K

Ans: 323.15 K.

Que (212): What is the amount of actual water vapour in air called as ________.
A. Absolute humidity
B. Precipitating temperature
C. Hot
D. Cold

Ans: Absolute humidity.
Absolute humidity refers to the actual mass of water vapor contained in a given volume of air, typically expressed in grams of water vapor per cubic meter of air (g/m³) or other similar units.

Que (213): What is Electric field intensity at a point inside a hollow charged spherical conductor?
A. Is zero
B. Is minimum charge of one
C. Is increasing
D. Is constant

Ans: Is zero,
This occurs because, in a state of static equilibrium, the charges within a conductor rearrange their positions to the extent that the electric field within the conductor is nullified.

Que (214): What happens to the column of water, When it is heated from 0°C to 10°C?
A. Only increases
B. Only decreases
C. First decreases then increases
D. First Increases then decreases

Ans: First decreases then increases,
At 4°C the water is most dense, hence heating water from 0°C to 10°C the volume is first decreases and then increases.

Que (215): With which instrument can a sailor in a submarine see the objects on the surface of sea?
A. Skethoscope
B. Periscope
C. Telescope
D. none of these

Ans: Periscope,
A periscope is an optical device that uses mirrors or prisms to reflect light, allowing the viewer to see objects above the water’s surface while the submarine remains submerged.

Que (216): At absolute zero temperature, what will be the kinetic energy of the molecules?
A. Zero
B. More than velocity
C. More than friction
D. Equal to the gravity

Ans: Zero.

Que (217): Which is the instrument that measures air pressure?
A. Annemometer
B. Barometer
C. Ammeter
D. None of these

Ans: Barometer,
Barometers are used to measure atmospheric pressure, which is the force exerted by the weight of the air above a certain point.

Que (218): By whom was the quantum theory first enunciated?
A. Einstien
B. Bohr
C. Max Plank
D. Max Born

Ans: By Max Planck,
In 1900, Planck introduced the concept of quantization of energy to explain the blackbody radiation spectrum. He proposed that energy is emitted or absorbed in discrete units or “quanta,” which later became a fundamental concept in the development of quantum mechanics.

Que (219): With rise of boiling point of a water, what will be the latent heat of steam?
A. Increases
B. Decreases
C. Remains constant
D. No changes

Ans: Remains constant.

Que (220): If a proton of mass m is moving with velocity of light, what will happen to its mass?
A. Increases
B. Drecreases
C. Constant
D. Remains unchanged

Ans: Remain unchanged.

Que (221): If we sprinkle common salt on an earthworm, why does it die?
A. Due to discomfort
B. Due to pain
C. Due to poison
D. Due to osmotic shock

Ans: Due to osmotic shock,
When salt is sprinkled on an earthworm, it creates a hypertonic environment due to its high concentration. As a consequence, water molecules from within the earthworm’s body move outward through its skin. This process occurs in an effort to balance the elevated salt concentration outside the worm. This loss of water causes the cells of the earthworm to shrink and can disturb its internal equilibrium. This disruption ultimately leads to dehydration and, over time, results in the death of the earthworm.

Que (222): What is the period of revolution of a geostationary satellite?
A. 12 hours
B. 24 hours
C. 48 hours
D. 60 hours

Ans: 24 hours,
A geostationary satellite orbits the Earth at an altitude and speed that allows it to complete one orbit in the same amount of time it takes the Earth to complete one full rotation on its axis, which is approximately 24 hours.

Que (223): What is the approximate velocity of light per second?
A. 3 × 10^8 m
B. 3 × 10^2 m
C. 3 × 10^5 m
D. 3 × 10^4 m

Ans: 3 × 10^8 m.

Que (224): Why are Clear nights cooler than cloudy nights?
A. Because of radiation
B. Absence of Sun
C. Presence of moon
D. Moon does not radiate heat

Ans: Because of radiation,
Clouds also act as a layer of insulation, preventing some of the heat absorbed by the Earth’s surface during the day from escaping at night.

Que (225): Of the floating iceberg in the sea, how much is the portion remaining above the sea level?
A. 1/10th
B. 1/11th
C. 1/12th
D. 1/13th

Ans: 1/10th.

Other relevant links:

Physics GK Mock Test – 1	Physics GK Mock Test – 2	Physics GK Mock Test – 3	Physics GK Mock Test – 4
Physics GK Mock Test – 5	Physics GK Mock Test – 6	Physics GK Mock Test – 7	Physics GK Mock Test – 8

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