TEST SERIES - 57 (I)

When a particle executing S.H.M. passes through the mean position, it has

• minimum kinetic energy and maximum potential energy

• maximum kinetic energy and minimum potential energy

• maximum kinetic energy and maximum potential energy

• minimum kinetic energy and minimum potential energy

Who among the following gave the first experimental value of Gravity?

• Newton

• Cavendish

• Galileo

• None of the above

The escape velocity from the surface of the earth does not depend on

• mass of the earth

• mass of the body

• radius of the earth

• gravity of the earth

The modulus of rigidity of a liquid is

• Zero

• One

• Infinite

• None of the above

Which of the following is most elastic?

• Rubber

• Wet clay

• Steel

• Plastic

If the radius of the earth shrinked by one per cent, its mass remaining the same, the value of gravity (g) on the earth’s surface would

• increase by 0.5%

• increase by 2%

• decrease by 0.5%

• decrease by 2%

Kerosene oil rises up in the wick of lantern because of

• Diffusion of the oil through the wick

• Surface tension

• Buoyant force of air

• The gravitational pull of the wick

When there are no external forces the shape of a liquid drop is determined by

• Surface tension of the liquid

• Density of the liquid

• Viscosity of air

• Temperature of air

If a liquid wets a solid surface, the angle of contact is

• 0°

• 90°

• Less than 90°

• Greater than 90°

A liquid will not wet the surface of solid if the angle of contact is

• Acute

• Obtuse

• Zero

• p/2