TEST SERIES - 57 (II)

A bird is sitting in a wire cage which is hanging from a spring balance. If the bird starts flying inside the cage, the reading of the spring balance will

• Remain unchanged

• Be less than earlier

• Be more than earlier

• None of the above

A hole is made in the bottom of a container having water filled up to a height h. The velocity of water flowing out of the hole is

• Independent of h1/2

• Proportional to

• Proportional to h

• Proportional to h2

An ideal fluid is flowing in a tube of varying cross-section. At some point the radius of the tube is r and the velocity of flow is v. The velocity of flow at another point, where the radius is r/2 is

• v/4

• v / 2

• 2 v

• 4 v

The value of which one of the following quantity remains same in all system of units?

• Acceleration due to gravity

• Specific gravity

• Pressure

• Density

Two teams are pulling a rope with equal and opposite forces each of 5 kN in a tug of war so that a condition of equilibrium exists. What will be the tensile force in the rope?

• Zero

• 2.5 kN

• 5 kN

• 10 kN

S.I. unit of surface tension is

• 2 N m

• N m

• Ns m

• J s

A floating body always displaces liquid equal to its own

• Mass

• Volume

• Weight

• None of the above

The length of second’s pendulum on surface of the moon, where g is 1 6 of the value of g on the surface of the earth, is

• 1 m 3

• 1 m6

• 6 m

• 36 m

A floating body always displaces liquid equal to its own

• Mass

• Volume

• Weight

• None of the above

SI unit of luminous intensity is

• Lumen

• Lux

• Candela

• Watt