______ 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.
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.
The reason for the diffusion of light in the atmosphere is?
(A) Carbon dioxide
(B) Water Vapor
(C) Helium
(D) Dust Particles
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.
Who discovered X-rays?
(A) Faraday
(B) Newton
(C) Rutherford
(D) none of these
What does the letter 'G' stand for in '2G Spectrum'?
(A) Gerwens
(B) Global
(C) Generation
(D) Google
The G in 2G, 3G and 4G stands for Generation, and they refer to the 2nd, 3rd and 4th generation of wireless technology. The higher the generation the better, fast, and powerful will be the network.
Which refrigerant is generally used in domestic refrigerators?
(A) Neon
(B) Oxygen
(C) Nitrogen
(D) Freon
While R-12 was once the go-to choice for residential/domestic refrigeration systems, Freon™ R-134a refrigerant is now most commonly used.
Which of the following properties of light can be used to explain the phenomenon of shadow formation?
A. Light travels in a straight line.
B. Light travels at a high speed.
C. Light is composed of seven colours.
D. Light does not pass through opaque objects.
(A) A and B
(B) B and C
(C) C and D
(D) D and A
The reflected light reaches our eyes and make that thing visible to us. Luminous objects like Sun, stars, electric bulbs etc have their own light and they are considered a source of light. Non Luminous objects are those objects which do not have their own light but reflect the light coming from some source.
When does dew fall?
(A) The moist air condenses on the cold surface
(B) The air is cooler than the surface of the earth
(C) The sky gets cloudy at night
(D) The air is so dry that it cannot rain
The deposition occurs when the temperature of the surface falls below the frost point. Similarly, dew forms when the air or surface temperature falls below the dew point temperature. (Note that the water vapor goes directly from gas to ice.
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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