Q. When a body is in equilibrium, the sum of clockwise moments about a pivot is equal to the

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Q. The SI unit of amplitude is

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Q. The number of complete waves produced per second is known as

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Q. The SI unit of frequency is

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Q. The height of a crest or depth of a trough measured from the rest position is referred as

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Q. The maximum displacement from the rest or center point is known as

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Q. The time taken for one point on the wave to complete one oscillation is known as

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Q. The SI unit of period is

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Q. The SI unit of wavelength is

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Q. The shortest distance between any two points in a wave that are in phase is called

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Q. When two points move in the same direction and have the same speed and same displacement from the rest position, they are said to be in

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Q. Any two crests or toughs are always in

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Q. The highest point o longitudinal wave is called

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Q. A diagram constructed to locate the position and type of image formed by a thin converging lens is known as

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Q. A magnifying glass is a

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Q. To produce a real, inverted and diminished image on film, a camera uses

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Q. A magnifying glass is used to make objects

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Q. For each angle of incidence, the corresponding value of angle of reflection is

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Q. The reflection depends on the object's

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Q. A periscope helps a person to look over a high wall or obstacles by using to plane mirrors inclined at

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