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# Physics Quiz in English - For Competitive Exams

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## Physics Quiz in English | Top Questions and Answers | Physics Quiz in English Mock Test

### Q1. SI unit of Viscosity is

Ans:  Decapoise
Explanation: SI unit of Viscosity is decapoise or pascal/sec. Viscosity of a fluid is measured by its coefficient of viscosity.

### Q2. Visocity is the property of

Ans:  Both Liquids and gases
Explanation: Viscosity is the internal friction of moving fluids, Viscosity of a liquid is due to cohesive force between its molecules. it is measured in force per unit area.

### Q3. Sudden fall in barometric reading is the indication of

Ans:  Storm
Explanation: Sudden fall in barometric reading indicates storm and slow fall indicates rain.

### Q4. Slow fall in barometric reading is the indication of

Ans:  Storm
Explanation: Slow fall indicates rain and sudden fall in the reading of barometer indicates storm. Barometer was invented by Evangelista Torricelli

### Q5. Speed of a planet is maximum when it is at

Ans:  Perigee
Explanation: Speed of a planet is maximum when it is at perigee and minimum when it is at Apogee.

### Q6. Escape velocity is also called

Ans:  Second cosmic velocity
Explanation: Escape velocity is dependent of the mass, shape, and size of the body and its direction of projection. For earth, escape velocity is 11.2 km/s and moon is 2.4 km/s.

### Q7. When momentum is doubled it's kinetic energy becomes

Ans:  4 times
Explanation: Momentum is directly proportional to velocity. When momentum is doubled its mass does not increase. When momentum is doubled it's kinetic energy becomes 4 times.

### Q8. When a ball is thrown vertically upward it's potential energy

Ans:  Increases
Explanation: When a ball is thrown vertically upward it's potential energy increases, kinetic energy decreases but total energy remains constant.

### Q9. A flying aeroplane has

Ans:  Both kinetic and potential energy
Explanation: A flying aeroplane has both kinetic and potential energy in it, as it depends on the height of the object above the surface of the earth

### Q10. Value of 'g' with height or depth from earth surface

Ans:  Decrease
Explanation: Value of 'g' decreases with the increase in height or depth of the earth. Value of 'g' decreases by 1% with respect to earth surface.

### Q11. The rocket which gives us information about Mars is:

Ans:  Atlas 5
Explanation: Atlas V is an active expendable launch system in the Atlas rocket family. Its notable payload included Mars reconnaissance Orbiter.

### Q12. When an object is heated, the molecules of that object:

Ans:  Began to move faster
Explanation: The molecules and the atoms begins to vibrate faster, when heat is added to the substance. The space between atoms increases as the atoms vibrate, taking up more space.

### Q13. The SI unit of temperature is:

Ans:  Kelvin
Explanation: SI unit of temperature is Kelvin, having the unit symbol K. It is named after William Thomson, Belfast born, Glasgow University engineer and physicist .

### Q14. Relative humidity is measured by:

Ans:  Hydrometer
Explanation: Hygrometer is an instrument that measures the amount of water vapour and humidity in the atmosphere, in soil or in confined space.

### Q15. The speed of sound in humid air is:

Ans:  More
Explanation: The speed of sound in humid air is more than dry air because the density of humid air is less than the density of dry air.

### Q16. On which factor the Pitch of a sound depends?

Ans:  Frequency
Explanation: Pitch is the characteristic sound which enables us to distinguish between sounds produced by two sources having the same intensity and pitch. The quality depends upon number, frequency and relative intensities of overtone.

### Q17. The normal temperature of Human body is:

Ans:  37° C
Explanation: There is not particular set temperature of the body of all human beings, it varies from person to person. However the average body temperature noted is 98.6°F or 37°C.

### Q18. Who invented the Centigrade scale?

Ans:  Anders Celsius
Explanation: Centigrade scale was invented by Anders Celcius, a Swedish astronomer, physicist and mathematician. In the year 1742 he proposed the Celsius scale, which bears his name.

### Q19. Earliest thermometer was developed by:

Ans:  Galileo
Explanation: Galileo is known to be the inventor of thermometer, a thermometer is an instrument that measures temperature differences. But Galileo's invention didn't did that, instead it merely indicated temperature differences.

### Q20. The correct value of 0° on the Kelvin scale is:

Ans:  273.15 K
Explanation: The correct value of 0° on the Kelvin scale is 273.15K. Kelvin and Celsius are two temperature scales. The lowest temperature theoretically attainable is indicated by Kelvin scale.

### Q21. If the earth were to stop rotating, the value of 'g':

Ans:  Increases
Explanation: The value of 'g' at equator, if the earth stops rotating will increase because when the earth rotates the gravity at every point remains uniform and when it stops rotating, the gravity increases as the pressure is exerted on only one point at the equator.

### Q22. What is SI unit of modulus of Elasticity:

Ans:  Newton/m2
Explanation: SI unit of modulus of elasticity is newton/m2, is the measure of an objects or substance's resistance to being deformed elastically when a force is applied to it.

### Q23. Which of following is a vector quantity?

Ans:  Momentum
Explanation: Momentum is vector quantity because it has both magnitude and direction. Energy, work and pressure have magnitude but no direction, hence they are Scalar quantity.

### Q24. Curie is the unit of:

Explanation: Curie is the unit of Radio activity. Radio activity was discovered by Marie curie, and hence the unit is named after her.

### Q25. Decibel is the unit of:

Ans:  Intensity of Sound
Explanation: Intensity of sound is measured in Decibel, denoted by symbol dB. It is the degree of loudness, human ear may damage above 80 dB of sound.

### Q26. SI unit of Luminous Intensity is:

Ans:  Luminous Intensity
Explanation: SI unit of Luminous Intensity is Candela denoted by symbol Cd. Force is Newton (N). Work is joule (J).

### Q27. Light year is the unit of?

Ans:  Distance
Explanation: Light year is the unit of distance, the distance travelled by light in one year in vacuum. 1 LY= 9.46 × 10^15 m.

### Q28. Number of basic SI unit is:

Ans:  7
Explanation: There are seven basic fundamental units, besides these seven fundamental units, two supplementary units are also defined, viz, radian and steridian. Radian for plane angle and Steradian for solid angle.

### Q29. SI unit of power is:

Ans:  Watt
Explanation: SI unit of power is watt, Length is metre, Amount of substance is mole, Mass is kilogram.

### Q30. Who discovered Electron?

Ans:  J.J Thomson
Explanation: Electron was discovered by J.J Thomson. Electron is -ively charged.

### Q31. Who discovered Proton?

Ans:  Goldstein
Explanation: Proton was discovered by Goldstein and named by Rutherford.

### Q32. Who discovered cloud chamber?

Ans:  C.R.T Wilson
Explanation: Cloud chamber was covered by CRT Wilson, is used to detect the presence and kinetic energy of radioactive particles.

### Q33. Radioactivity is detected by:

Ans:  GM Counter
Explanation: Geiger–Mueller Counter abbreviated as GM Counter, is an instrument used for detecting and measuring ionizing radiation.

### Q34. The device used for measuring the wavelength of X-rays is:

Ans:  Bragg spectrometer
Explanation: Bragg spectrometer is the instrument used to analyse crystal structure by using X-rays.

### Q35. Intensity of a wave:

Ans:  Follows Inverse Square Law
Explanation: The intensity of a wave obeys Inverse Square Law and is proportional to the square of the amplitude.

### Q36. The difference between isotopes of an element is due to the presence of a different number of:

Ans:  Neutrons
Explanation: All isotopes have the same number of protons but differ in their number of neutrons in each atom.

### Q37. Which of the following quantities is the measure of 'inertia'?

Ans:  Mass
Explanation: Measure of inertia is mass, inertial mass can be defined as a quantitative measure of an object's resistance to acceleration.

### Q38. Neutrons are slowed down in a nuclear reactor by

Ans:  Moderator
Explanation: In thermal nuclear reactors, the coolant as a moderator slow down the neutrons before they they can be efficiently absorbed by the fuel.

### Q39. Light scattering takes place in:

Ans:  Acidic solutions
Explanation: Light scattering in colloidal solution in suspension is known as Tyndall Effect. It is similar tobRayleigh scattering.

### Q40. Tape recorder records sounds in the form of:

Ans:  Magnetic energy
Explanation:

### Q41. Beta particles emitted from a radioactive nuclei are:

Ans:  Fast moving electrons
Explanation:

### Q42. In the resistance colour code, the fourth band signifies:

Ans:  Tolerance level
Explanation:
Physics Quiz in English - For Competitive Exams

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