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-I | List-II |
A. Wavelength | 1. Hertz |
B. Energy | 2. Angstrom |
C. Intensity of sound | 3. Joule |
D. Frequency | 4. 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) |