Physics MCQ Questions  with Answer for all Competitive Exams

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Physics MCQ Questions  with Answer

Q1. Ice is packed in sawdust because

(a) Sawdust does not stick to the ice

(b) Sawdust will not get melt easily

(c) Sawdust is a good conductor of heat

(d) Sawdust is a poor conductor of heat

Answer: (d)

Explanation: Sawdust is a poor conductor of heat. Thus it does not let the atmospheric heat to pass through it and melt the ice.

Q2. ​Which of the following is the smallest unit of length? ​

(a)​ Micrometre ​

(b)​ Nanometre ​

(c)​ Angstrom ​

(d)​ Fermi meter

Answer: (d)​

Explanation: 1 micron = 10–6 m ​​

1 nanometre = 10–9 m ​​

1 angstrom = 10–10 m ​​

1 Fermi = 10–15 m

Q3. A simple machine helps a Fenton in doing:

(a) Less work

(b) The same amount of work with lesser force

(c) The same amount of work slowly

(d) The same amount of work much faster

Answer: (b) The same amount of work with lesser force

Explanation: A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage to multiply force. Thus, a simple machine helps us in doing the same amount of work with lesser force. Few examples of simple machines are pulley, lever, wheel, screw, etc.

Q4. Water is used in a car radiator because of its

(a) Low density

(b) Easy availability

(c) High specific heat capacity

(d) Low boiling point

Answer: (c)

Explanation: Water has high specific heat which allows water to draw up more heat from the radiator and hence keeps it cool.

Q5. The working principle of a washing machine is ​

(a) ​Centrifugation ​

(b)​ Dialysis

​(c)​ Reverse osmosis ​

(d) ​Diffusion

Answer: ​(a)​

Explanation: The washing machine works on the principle of centrifugation. Centrifugation is a process that involves the use of the centrifugal force for the separation of mixtures with a centrifuge, used in industry and in laboratory settings. More-dense components of the mixture migrate away from the axis of the centrifuge, while less-dense components of the mixture migrate towards the axis.

Q6. Which one of the following is a vector quantity?

(a) Momentum

(b) Pressure

(c) Energy

(d) Work

Answer: (a)

Explanation: Scalars are quantities that have magnitude only; they are independent of direction. Vectors have both magnitude and direction. Momentum is the product of the mass and velocity of an object (p = mv). Momentum is a vector quantity since it has a direction as well as a magnitude. The rest of the quantities in option pressure, work, and energy has magnitude but not direction.

Q7. Match List-I with List-II and select the correct answer using the codes given below the lists:

List-IList-II
A. Wavelength1. Hertz
B. Energy2. Angstrom
C. Intensity of sound3. Joule
D. Frequency4. Decibel

Codes: A B C D

(a)         2 3 4 1

(b)        1 2 3 4

(c)         2 3 1 4

(d)        2 1 3 4

Answer: ​(a)​

Explanation: Wavelength is the distance between two consecutive crests or troughs and 1 angstrom = 10–10 m, a joule is the unit of energy. The intensity of sound is measured in decibel. Frequency is measured in hertz (Hz).

Q8. Alcohol is more volatile than water because ______ is lower than water.

(a) Its boiling point

(b) Its density

(c) Its viscosity

(d) Its surface tension

Answer: (a)

Explanation: Lower the boiling point higher is the volatility. Alcohol has boiling point 78°C whereas the boiling point of water is 100°C.

Q9. What is the correct sequence in which the lengths of the following units increase? ​

1.​Angstrom

​2. ​Micron

​3. ​Nanometre ​

Select the correct answer using the codes given below:​ ​

(a) ​1, 2, 3 ​

(b)​ 3, 1, 2 ​

(c)​ 1, 3, 2 ​

(d)​ 2, 3, 1

Answer: ​(c) ​

Explanation: The multiplier for the given units are as follows: ​

1 Angstrom​=​10–10 m ​

2 ​Micron​=​10–6 m ​

3​ Nanometre​= 10–9m ​​

Hence, the order in which the lengths of the given units increase is given by ​​Angstrom, Nanometre, Micron. Therefore, the correct sequence is 1, 3, and 2.

Q10. What is the SI unit of temperature?

(a) Kelvin

(b) Joule

(c) Celsius

(d) Fahrenheit

Answer: (a)

Explanation: S.I. unit of temperature is Kelvin (K) named after Lord Kelvin. The Kelvin is defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water (exactly 0.1°C or 32.018°F)

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