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Physics MCQs | Objective Type Questions SET-8
1.The Kinetic energy of a satellite is maximum in which of the following conditions?
Answer: A [when the satellite is at perigee]
Notes:
The Kinetic energy will be maximum when the satellite is closest to the central body (at perigee) and minimum when it is farthest from the central body (at apogee). Potential energy will be minimum when kinetic energy = maximum i.e., the satellite is closest to the central body (at perigee) and maximum when kinetic energy = minimum i.e., the satellite is farthest from the central body (at apogee).
The Kinetic energy will be maximum when the satellite is closest to the central body (at perigee) and minimum when it is farthest from the central body (at apogee). Potential energy will be minimum when kinetic energy = maximum i.e., the satellite is closest to the central body (at perigee) and maximum when kinetic energy = minimum i.e., the satellite is farthest from the central body (at apogee).
2.Which of these states of matter has the maximum density?
Answer: A [Solids]
Notes:
The density is maximum in case of solids. In the case of liquids, the density is less than solids but more than gases. In gases, the density is minimum.
The density is maximum in case of solids. In the case of liquids, the density is less than solids but more than gases. In gases, the density is minimum.
3.Which of the following relations between Kinetic energy and Potential energy is true about solids?
Answer: D [Kinetic energy < Potential energy]
Notes:
In Solids, Kinetic energy is always less than the Potential energy. For liquids, Kinetic energy > Potential energy. For Gases, Kinetic energy >> Potential energy.
In Solids, Kinetic energy is always less than the Potential energy. For liquids, Kinetic energy > Potential energy. For Gases, Kinetic energy >> Potential energy.
4.What is the stress known as when there is a relative displacement between various layers of solid?
Answer: A [Tangential]
Notes:
When successive layers of solid move on each other i.e. when there is a relative displacement between various layers of solid, the stress produced is called as Tangential stress.
When successive layers of solid move on each other i.e. when there is a relative displacement between various layers of solid, the stress produced is called as Tangential stress.
5.In which form is the work done in stretching a wire stored as?
Answer: B [Potential energy]
Notes:
In stretching a wire work is done against internal restoring forces. This work is stored in the wire as elastic potential energy. It is also known as strain energy
In stretching a wire work is done against internal restoring forces. This work is stored in the wire as elastic potential energy. It is also known as strain energy
6.Which of the following statements about Pressure and Stress is NOT correct?
Answer: D [Stress is always compressive in nature]
Notes:
Pressure is always normal to the area but Stress can be normal or tangential to the area. Pressure is always compressive in nature but Stress may be compressive or tensile in nature.
Pressure is always normal to the area but Stress can be normal or tangential to the area. Pressure is always compressive in nature but Stress may be compressive or tensile in nature.
7.When will the height of water in capillary tube be minimum?
Answer: B [When water temperature is 4° C]
Notes:
The height up to which water will rise in a capillary tube will be minimum when water temperature is 4° C. It is the temperature at which liquid water has the highest density.
The height up to which water will rise in a capillary tube will be minimum when water temperature is 4° C. It is the temperature at which liquid water has the highest density.
8.What is the unit of Specific gravity?
Answer: D [ No units ]
Notes:
Specific gravity is a unitless quantity. Specific gravity is the ratio of two same dimensions. The dimensions of density is M1 L– 3
Specific gravity is a unitless quantity. Specific gravity is the ratio of two same dimensions. The dimensions of density is M1 L– 3
9.What is the phase of a vibrating particle at t = 0 known as?
Answer: A [epoch]
Notes:
Initial phase or epoch is the phase of a vibrating particle at t = 0. When t = 0; Phase is the angle of epoch.
Initial phase or epoch is the phase of a vibrating particle at t = 0. When t = 0; Phase is the angle of epoch.
10.What is the length of second’s pendulum?
Answer: C [99.3 cm]
Notes:
Putting T = 2 sec and g = 9.8m / sec in T = 2π (l/g)1/2, we get l = 99.3 cm Hence length of second’s pendulum is 99.3 cm or nearly 1 m.
Putting T = 2 sec and g = 9.8m / sec in T = 2π (l/g)1/2, we get l = 99.3 cm Hence length of second’s pendulum is 99.3 cm or nearly 1 m.
