physics Mcqs
751. In fission process_______.
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A. massive nucleus join together

B. massive nucleus splits to form smaller fragments

C. both A & B

D. None of these

752. The performance of a refrigerator is described by________________?
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A. efficiency

B. coefficient of performance

C. both A and B

D. not described

753. The value of ? for diatomic gas is_______________?
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A. 1.4

B. None

C. 1.67

D. ? = 1.3

754. Who were the pioneers of Physics?
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A. Latin

B. Persians

C. Greek

D. Egyptians

755. If a lift is going up with acceleration, the apparent weight of a body is:
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A. More or less the true weight

B. More than the true weight

C. Less than the true weight

D. Equal to the true weight

756. To measure the speed of an approaching car a police officer shines?
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A. ultra high frequency waves on it

B. light waves on it

C. microwaves on it

D. radio waves on it
757. In addition to the daughter nucleus and an electron or positron, the products of a beta decay
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A. Proton

B. Neutrino

C. Alpha particle

D. Neutrons

758. The operation of a transistor requires______________?
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A. None of the above

B. That the emitter be heated

C. That the collector be heated

D. That the base be heated

759. Gravitation force of moon is_________?
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A. 1.62 m/s

B. 7.2 m/s

C. 3.75 m/s

D. 9.8 m/s

760. Depletion region of a junction is formed_____________?
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A. under forward bias

B. under reverse bias

C. when temperature varies

D. during the manufacturing process
761. Farad is the unit of___________?
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A. None of these

B. inductance

C. capacitance

D. voltage

762. CGS unit of Force is_________?
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A. Joule

B. Newton

C. Dyne

D. Erg

763. The minimum wavelength of X-rays can further be reduced by _______________?
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A. Increasing the temperature of the filament.

B. Reducing the pressure or cooling the target

C. Increasing the potential difference between the cathode and the target

D. Using a target element of higher atomic number

764. The simplest type of rectification known as half wave rectification is obtained by____________________?
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A. suppressing the harmonics in A.C voltage

B. using a transistor

C. suppressing half wave of A.C supply by using diode

D. using a Coolidge tube

765. Which one of the following is not a donor impurity ?
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A. antimony

B. arsenic

C. aluminium

D. phosphorus

766. Kirchhoffs 2nd rule is related to: ___________?
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A. IR Drops

B. Battery emf

C. junction voltages

D. both 1 and 2
767. Ohm is a unit of measuring _________?
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A. Voltage

B. Resistance

C. None of these

D. Current

768. The operational amplifier is______________?
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A. A high gain amplifier

B. A low resistance amplifier

C. A high resistance amplifier

D. A high-power amplifier

769. The mass-energy relation is the outcome of____________?
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A. None of these

B. Quantum theory

C. General theory of relativity

D. Special theory of relativity
770. The characteristic X-rays spectrum is due to_____________?
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A. The bombardment of target by electrons

B. The illumination of the target metal by ultra-violet radiation

C. The bombardment of the target by protons

D. The absorption of radiation by the target metal

771. Electrons present in p-type material due to thermal pair generation are_____________?
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A. majority carriers

B. dual carriers

C. blockers

D. minority carriers
772. Non-inverting amplifier circuits have____________?
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A. None of the above

B. A very low input impedance

C. A low output impedance

D. A very high input impedance
773. In the transistor schematic symbol, the arrow______________?
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A. is locate on the collector

B. is located on the emitter

C. is located on the base

D. points form north to south

774. Rain drops fall from great height Which among the following statements is true regarding it?
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A. their velocity increases and they fall with same velocity on the earth

B. their velocity increases and they fall with different velocity on the earth

C. they fall with same ultimate velocity

D. they fall with that ultimate velocity, which are different for different droplets
775. At what temperature is the Fahrenheit scale reading equal to twice that of the Celsius scale?
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A. 160C

B. 360C

C. 280C

D. 460C

776. Thermions are________________?
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A. photons

B. positrons

C. electrons

D. protons

777. A stone is thrown upward from the top of a 59.4m high cliff with an upward velocity component of 19.6m/s how long is the stone in the air?
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A. 7.00 s

B. 4.00 s

C. 6.00 s

D. 5.00 s

778. Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?
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A. B & C

B. A & B

C. A & C

D. A B & C

779. The efficiency of the Carnot engine working between 150C and 50C is__________?
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A. 29.40%

B. 23.6%

C. 100%

D. 50%

780. In He-Ne laser the lasing action is produced by_______________?
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A. Ne only

B. He-Ne both

C. Electrons Ne

D. Electrons of He

781. What is the force of attraction between any two bodies by virtue of their masses is called?
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A. Centripetal Force

B. Electromagnetic Force

C. Gravitational Force

D. Nuclear Force

782. Oil rises up to wick in a lamp because_____________?
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A. Capillary action phenomenon

B. Oil is volatile

C. Oil is very light

D. Diffusion of oil through the wick

783. In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?
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A. Metal stable state

B. All the above

C. Normal state

D. Inverted population
784. Which instrument is suitable to measure the internal diameter of a test tube?
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A. None

B. Screw Gauge

C. Vernier Callipers

D. Bore Gauge

785. Average translational kinetic energy per molecule of an ideal gas is given by_____________?
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A. 3RT/2Na

B. 3Na/2RT

C. 2NaT/3

D. 3NaT/2R

786. Why the needle of iron swims on water surface when it is kept gently ?
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A. due to its shape

B. due to surface tension

C. It will remain under the water, when it will displace more water than its weight

D. the density of needle is less than that of water

787. In the transistor schematic symbol, the arrow_______________?
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A. is located on the emitter

B. points form north to south

C. is located on the base

D. is locate on the collector

788. In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?
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A. impossible to predict

B. he/ev

C. eV/h

D. he/Vc

789. Temperature is a property which determines_________________?
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A. How much heat a body contains

B. Whether a body will feel hot or cold to touch

C. In which direction heat will flow between two systems

D. How much total absolute energy a body has

790. Gravitation force of earth is___________?
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A. 9.80 m/s

B. 7.21 m/s

C. 1.62 m/s

D. None of these

791. Which one of the following is not a radioactive element ?
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A. Radium

B. Thorium

C. Uranium

D. Cadmium
792. The Capacity of doing work is called_________?
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A. Energy

B. Work

C. Momentum

D. Power

793. CGS system of units is also called __________?
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A. None of these

B. Metric or French system of units

C. Metric system

D. Metric or British system of units

794. Which one of the following has the highest value of specific heat?
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A. Water

B. Methane

C. Kerosene

D. Alcohol

795. Mohus scale is used for to measure ____________?
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A. Hardness

B. Humidity

C. Temperature

D. Pressure

796. In a clinical thermometer the mercury in the capillary tube does not contract once removed from the patient because_______________?
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A. The amount of mercury use is very small

B. The capillary tube has a small constriction near the bulb

C. Mercury takes a long time to contract

D. The capillary tube is very narrow

797. Gravitation force of sun is__________?
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A. 274 m/s

B. 362 m/s

C. 300 m/s

D. None of these

798. Medium which sends signal from source to destination is known as ________ ?
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A. Hardware

B. Receiver

C. Transmitter

D. Transmission channel
799. For a gas obeying Boyles law if the pressure is doubled the volume becomes________________?
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A. one fourth

B. one half

C. double

D. four times

800. In n-p-n transistor, p works as______________?
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A. emitter

B. base

C. any of above

D. collector