Question : Action and reaction ___________.

Option 1: always act on the same body

Option 2: are equal in magnitude

Option 3: are in the same direction

Option 4: always act independently

Question : A solid right circular cylinder and solid hemisphere stand on equal bases and have the same height. The ratio of their whole surface area is:

Option 1: 3 : 2

Option 2: 3 : 4

Option 3: 4 : 3

Option 4: 2 : 3

Question : If both the mass and the velocity of a body are increased to twice their magnitude, the kinetic energy will increase by:

Option 1: 2 times

Option 2: 4 times

Option 3: 8 times

Option 4: 16 times

Question : Which one of the following attributes is not true for uniform circular motion?

Option 1: The speed of the body remains constant

Option 2: Velocity is always perpendicular to the radius of the circle

Option 3: The velocity of the body is continuously changing

Option 4: The distance is always equal to the displacement

Question : The bleaching action of chlorine is due to which reaction?

Option 1: Oxidation

Option 2: Hydrolysis

Option 3: Redox

Option 4: Decomposition

Question : Contours are imaginary lines showing

Option 1: Places of equal atmospheric pressure

Option 2: Same temperature areas

Option 3: Places of equal altitude

Option 4: Equal sunshine areas