In series connection the current flow through each resistor is?
Stars which appear single to the naked eye but are double when seen through a telescope are
One Kilowatt-hour is equal to?
Gravitational force is responsible for?
When a sound wave goes from one medium to another, the quantity that remains unchanged is
In the analysis of projectile motion, it is assumed that effect of air resistance is?
A 20 cm length of a certain solution causes right handed rotation of 38°. A 30 cm length of another solution causes left handed rotation of 24°. The optical rotation caused by 30 cm length of a mixture of the above solutions in the volume ratio 1 : 2 is
According to Ohm’s Law? current I = KV, where K is
If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same
With what velocity should an observer approach a stationary sound source so that the apparent frequency of sound should appear double the actual frequency? (v is velocity of sound).
Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
Of the following properties of a wave, the one that is independent of the other is its
A Carnot's engine operates with source at 127°C and sinks at 27°C. If the source supplies 40 kJ of heat energy, the work done by the engine is
The charge on an electron is known to be 1.6 x 10-19 coulomb. In a circuit the current flowing is 1 A. How many electrons will be flowing through the circuit in a second?
Refractive index of an optical medium chan geswith
1. the nature of the medium.
2. the change in the angle of incidence of the ray.
3. colour of the incident ray.
Select the correct answer using the code given below:
A plane mirror is approaching you at a speed of 10 cm/s you can see your image in it. At what speed will your image approach you?
According to Einstein's photoelectric equation, the graph of K.E. of the photoelectron emitted from the metal versus the frequency of the incident radiation gives a straight line graph, whose slope ______.
Consider the following statement:
The principle of total internal reflection is
applicable to explain the
1. Formation of mirage in desert.
2. Formation of image in microscope.
3. Colour of evening sky.
4. Operation of optical fibres.
Which of the statement given above are correct?
The equation for the mass of earth is?
Consider the following statements:
1. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is.
2. If a person under water looks at a coin above, the water surface, the coin will appear to be at a higher level than it really is.
Which of the above statements is/are correct?
An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observer?
(speed of light = 3 × 108 ms–1)
What does the term Dolby B or Dolby C printed on tape recorders and other sound systems refer to?
The total flight requires a time that is?
Pa(Pascal) is the unit for
The weight of the body is given by?
Metals are good conductors of electricity because
Mach number is used in connection with the speed of
A closed organ pipe and an open organ pipe of same length produce 2 beats/second while vibrating in their fundamental modes. The length of the open organ pipe is halved and that of closed pipe is doubled. Then, the number of beats produced per second while vibrating in the fundamental mode is ______.