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PAGE NO: 284 Solution 1: The frequency of sound is defined as the number of vibrations produced by the sound producing object per second. Solution 2: S.I unit of frequency is hertz. Solution 3: One...
PAGE NO: 278 Solution 1: Yes, Sound is form of energy. Solution 2: Sound is produced by the vibrating objects. Solution 3: No, sound cannot travel through vacuum. Solution 4: Yes, sound can propagate...
PAGE NO: 261 Solution 1: Convex mirror has a wider field of view. Solution 2: Convex mirror always produces an erect image of the object. Solution 3: Convex mirror is used in vehicles to see the...
PAGE NO: 258 Solution 1: A spherical mirror is a part of a hollow glass sphere silvered on one side. Solution 2: Solution 3: Focal length = 1/2 of radius of curvature = 1/2 x 30 = 15cm. Solution 4:...
PAGE NO: 245 Solution 1: Light may be defined as the radiant energy which produces in us the sensation of sight. Light itself is invisible but makes other objects visible. Solution 2: Yes, light is a...
PAGE NO: 226 Solution 1: Conduction, convection and radiation are three modes of transfer of heat. Solution 2: The process of conduction involves the transmission of heat from the hot end to the cold...
PAGE NO: 209 Solution 1: Temperature is the quantity that tells about the thermal state of a body i.e. the degree of hotness or coldness of a body. Solution 2: Thermometer is used for measuring the...
PAGE NO: 202 Solution 1: Coefficient of Linear expansion is equal to the change in length of a rod of length 1m when its temperature rises by 1°c. Coefficient of superficial expansion is equal to the...
PAGE NO: 191 Solution 1: Heat is defined as a form of energy which flows from one point to another on account of temperature difference. Solution 2: Yes, heat is a form of energy Solution 3: Joule is...
PAGE NO: 157 Solution 1: The thrust on the unit surface is known as pressure. The SI unit of pressure is Nm -2 . Solution 2: Pressure is given by P = h X p X g . Where h is height of liquid column, p...
PAGE NO: 113 Solution 1: The property by which a body neither changes its present state of rest or of uniform motion in a straight line nor tends to change the present state is known as inertia....
PAGE NO: 61 Solution 1: A body is said to be in state of rest if it does not change its position with respect to its surrounding objects with time. Solution 2: A vector quantity is that physical...