CBSE
Multiple Choice QuestionsWhen a drop splits up into a number of drops, then :
Area increases
Volume increases
Energy is absorbed
Energy is liberated
In a capillary tube experiment, a vertical, 30 cm long capillary tube is dipped in water. The water rises upto a height of 10 cm due to capillary action. If this experiment is conducted in a freely falling elevator, the length of the water column becomes :
10 cm
20 cm
30 cm
zero
An aeroplane gets its upward lift due to a phenomenon described by the :
Archimedes principle
Bernoulli's principle
Buoyancy principle
Pascal law
If work done in increasing the size of a soap film from 10 cm x 6 cm to 10 cm x 11 cm is 2x10-4 J, then surface tension is
2x10-2 Nm-1
2x10-4 Nm-1
2x10-6 Nm-1
2x10-8 Nm-1
At which of the following temperatures, the value of surface tension of water is minimum
4º C
25º C
50º C
75º C
Work done in splitting a drop of water of 1 mm radius into 64 droplets is (surface tension of water = 72x 10-3 J/m2)
2.0 x 10-6 J
2.7 x 10-6 J
4 x 10-6 J
5.4 x 10-6 J
Consider the following equation of Bernoulli's theorem
(constant)
The dimensions of K/P are same as that of which of the following?
Thrust
Pressure
Angle
Viscosity
At which of the following temperature, the value of the surface tension of water is minimum?
4°C
25°C
50°C
75°C
A 700 g solid cube having an edge of length 10 cm floats in water. The volume of the cube outside water is :
2.4 cm3
4.8 cm3
300 cm3
500 cm3
Why the dam of the water reservoir is thick at the bottom?
Quantity of water increases with depth
Density of water increases with depth
Pressure of water increases with depth
Temperature of water increases with depth
