Physics-Objective Related Question Answers

76. An influence that changes the state of rest in a straight line of a body is called?

Force F= ma [m = mass; a = acceleration]

77. Unit of Force is?

Newton or Kg m/s2

78. CGS unit of Force is -?

Dyne

79. Strongest force in the universe is?

Nuclear force

80. Weakest force in the universe, ?

Gravitational Force

81. Force acting for a short time?

Impulsive force

82. Force which acts on a body moving in a circular path and it is directed towards centre is called?

Centripetal force

83. The force required by a Vehicle moving round a curved road is?

Centripetal force

84. Force that acts on a body moving in a circular path and is directed away from the centre is called?

Centrifugal force

85. The force that helps to separate cream from milk is?

Centrifugal force

86. Capability of rotating objects around a fixed axis is called?

Torque

87. Force that resists the movement of one surface over another is called?

Frictional Force

88. The substances which reduce the frictional force between moving surfaces?

Lubricants eg : Grease; Oil; Graphite

89. Force acts in a direction opposite to the direction of motion is?

Static friction

90. Force occurs when two objects are moving relative to each other or rub together is?

Kinetic friction

91. Force acts when two bodies role one another?

Rolling friction

92. Force of attraction between unlike molecules is termed as?

Adhesion

93. Water drop sticks on glass surface is an example of ….force?

Adhesion

94. Force of attraction between like molecules is termed as?

Cohesion

95. Water molecules join together is an example of ….force?

Cohesion

96. Frictional force acting between parallel layers of a liquid is called?

Viscosity

97. Unit of viscosity is?

Poise

98. With increase in temperature, viscosity .?

Decreases

99. Viscosity of gas is less than viscosity of?

Liquid

100. Viscosity of an ideal fluid is?

Zero
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