UPSC,PCS,CDS,NDA /General Science - Physics MCQs Part2 Sample Test,Sample questions

Question:
As per Ohm’s law, if the resistance of a conductor is doubled, what will be the effect on the current flowing through it?

1. it gets doubled

2. it gets halved

3.it increases 4 times

4.No change


Question:
For how long approximately an image persists on the retina before vanishing?

1. 1/8 seconds

2.1/16 seconds

3.1/32 seconds

4.1 second


Question:
How can a moving coil galvanometer be converted into a ammeter?

1.by introducing shunt resistance in parallel

2.by introducing shunt resistance in series

3.by introducing large resistance in series

4.None of the above


Question:
Which of the following represents ideal gas law?

1.PVT = constant

2.PT/V = constant

3.PV/T = constant

4.VT/P = constant


Question:
What are the nuclei of different atoms containing same number of neutrons known as?

1. Isobars

2. Isotopes

3.Isotones

4.Isomers


Question:
What do we call the phenomenon of spontaneous disintegration of the nucleus of an atom?

1. Nuclear Fusion

2.Ionisation

3.Radioactivity

4.Covalent Bonding


Question:
What do we call the process in which no exchange of heat energy takes place between the gas and the surroundings?

1. Adiabatic

2.Isothermal

3.Isochoric

4.Isobaric


Question:
What do we call the temperature and pressure at which solid, liquid, and vapor phases of a particular substance coexist in equilibrium?

1.Equilibrium point

2.Triple point

3. Normal point

4.None of the above


Question:
What happens to the resistance of a p-n junction diode when forward biased?

1.it becomes high

2.No effect

3.it becomes low

4.it becomes zero


Question:
What is the branch of physics that deals with the concepts of heat and temperature and the inter-conversion of heat and other forms of energy is known as?

1.Calorimetry

2.Thermodynamics

3.Thermostatics

4. Electrostatics


Question:
What is the ratio of the change in collector current to the change in base current at a constant collector-emitter voltage, when the common emitter transistor is in active state, known as?

1. Input resistance

2.Output resistance

3.Current amplification factor

4.None of the above


Question:
What is the size of the image formed by a concave mirror when the object is at focus?

1.Enlarged

2.Point sized

3.Same size

4.Highly enlarged


Question:
What is the work done to move a unit charge from point to another called as?

1.Current

2.Resistance

3. Conductance

4.Potential Difference


Question:
Which of the following element has an isotope named as Tritium?

1. Helium

2.Carbon

3.Titanium

4.Hydrogen


Question:
Which of the following exchanges with the surrounding take place in a closed system?

1.Both matter and energy

2.Only energy

3.Only matter

4.No exchange


Question:
Which of the following eye-defects is also known as far -sightedness?

1.Myopia

2.Hyper-metropia

3.Cataract

4.None


Question:
Which of the following is correct about conductors?

1.The conduction band and the valence band partly overlap each other

2.There is no forbidden energy band gap between conduction band and the valence band

3.Both a and b

4.None of the above


Question:
Which of the following is correct as per the second law of thermodynamics?

1.Efficiency of a heat engine can never be zero

2.Efficiency of a heat engine can never be unity

3. Efficiency of a heat engine is always unity

4.None of the above


Question:
Which of the following is correct?

1.Freely suspended magnet always align in north-south direction

2.Magnetic poles of a magnet are of equal strength

3.Both a and b

4.None of the above


Question:
Which of the following is NOT correct about the force of interaction between two poles of a magnet, as per coulomb’s law?

1.directly proportional to the product of the pole strength

2.directly proportional to the square of the distance r between the poles

3.Both a and b

4.None of the above


Question:
Which of the following is the phenomenon responsible for the trade winds?

1.Convection

2.Conduction

3.Radiation

4.None of the above


Question:
Which of the following is true about a concave lens?

1.power of a concave lens is positive

2.power of a concave lens is negative

3. power of a concave lens is zero

4.None of the above


Question:
Which of the following is true about a cyclic process?

1.the total heat absorbed equals the work done by the system.

2.the system returns to its initial state

3.Both a and b

4.None


Question:
Which of the following is true about metals?

1.They are good conductors of electricity

2.They have low resistivity

3.Both a and b

4.None of the above


Question:
Which of the following mirrors is commonly used as rear-view mirror in a vehicle?

1.Concave mirror

2. Convex mirror

3.Plain mirror

4.None of the above


Question:
Which of these phenomenon is due to the scattering of light?

1.blue colour of sky

2. reddening of the Sun at sunrise

3.reddening of the Sun at sunset

4.All of the above


Question:
Which of these rays have the highest penetrating power?

1.Alpha

2.Beta

3.Gamma

4. All have the same


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