What is the reason for the spherical shape of a liquid drop?
(A) Viscosity
(B) Light Load
(C) Surface Tension
(D) Atmospheric Pressure
In optics, the refractive index of a substance is described by the formula n = c/v, where c is:
(A) the speed of light in medium
(B) the centre of curvature
(C) the radius of the sphere
(D) the speed of light in vacuum
Refractive Index Formulan is the refractive index. c is the velocity of light in a vacuum ( 3 × 108 m/s) v is the velocity of light in a substance.
The colour of the sky appears to be blue.
(A) due to diffraction
(B) due to scattering
(C) due to reflection
(D) due to refraction
The reason for the diffusion of light in the atmosphere is?
(A) Carbon dioxide
(B) Water Vapor
(C) Helium
(D) Dust Particles
The application of low-temperature engines is?
(A) submarine propulsion
(B) research on superconductivity
(C) rocket technology
(D) frost free refrigerators
What happens to the temperature of a liquid when it evaporates?
(A) increase
(B) remain unchanged
(C) grow faster
(D) decrease
During the process of evaporation of liquid the temperature of the liquid decreases because the surface molecules while evaporating take some amount of energy from the other molecules of liquid. Thus, evaporation leads to cooling. Kinetic energy is proportional to absolute temperature.
he temperature at which ice, water and vapour remain in equilibrium is called?
(A) freezing point
(B) triple point
(C) critical temperature
(D) boiling point
The technical term for this is the triple point of water since at this temperature, not only solid ice and liquid water, but also water vapor coexist. The temperature and pressure conditions that allow a substance's gaseous, liquid, and solid phases to exist in equilibrium is called triple point of the substance.
______ in a particular direction is velocity.
(A) Acceleration
(B) Displacement
(C) Speed
(D) Distance
A straight object moving in a specific direction is said to have velocity. As a result, velocity refers to an object's speed in a specific direction.
Where will it take more time to cook rice?
(A) on the beach
(B) in Shimla
(C) Mount Everest
(D) at the depth of the sea
Light rays from an object fall on a surface and get reflected in a completely diffused manner. What can you say about the nature of the image of the object?
(A) It will be virtual and of same size.
(B) It will be real and enlarged.
(C) It will be virtual and enlarged.
(D) No image will be formed.
Light rays from an object fall on a surface and get reflected in a completely diffused manner. What can you say about the nature of image of the object ? It will be virtual and of same size.
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