Faraday law of electrolysis indirectly shows
quantisation of charge
quantisation of angular momentum
quantisation of current
quantisation of viscosity
In old age arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from
Pascal's law
Stoke's law
Bernoulli's principle
Archimede's principle
In an adiabatic change , the pressure and temperature of a monoatomic gas are relted as P ∝ TC, where C equals
A large horizontal surface moves up and down in S.H.M with an amplitude of 1 cm. If a mass of 10 kg ( which is placed on the surface) is to remain continuously in contact
5 Hz
0.5 Hz
1.5 Hz
10 Hz
A siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s. The frequency of sound heard by listener is ( velocity of sound = 300 m/s )
727.3 Hz
481.2 Hz
644.8 Hz
286.5 Hz
Which of the following physical quantities do not have same dimensions?
pressure and stress
tension and surface tension
strain and angle
energy and work
Work of 3.0 × 10-4 joule is required to be done in increasing the size of a soap film from 10 cm × 6 cm to 10 cm × 11 cm. The surface tension of the film is
5 × 10-2 N/m
3 × 10-2 N/m
1.5 × 10-2 N/m
1.2 × 10-2 N/m
If the water falls from a dam into a turbine wheel 19.6 n below, then the velocity of water ar turbines is ( Take g = 9.8 m/s )
9.8 m/s
19.6 m/s
39.2 m/s
98.6 m/s
B.
19.6 m/s
This problem depends on the Speed of Efflux: Torricelli's Law. The word efflux means fluid outflow. Torricelli discovered that the speed efflux from an open tank is given by a formula identical to that freely falling body.
v = √(2 g h)
= √(2 x 9.8 x 19.6)
v = 19.6 m/s
Assertion: Ferro magnetic substances become paramagnetic above Curie temperature.
Reason: Domains are destroyed at high temperature.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion: A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation.
Reason: All metals act as black bodies.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false