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).
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?
Consider the following statements :
Hypermetropia is a defect of vision in which
1. a person cannot see the distant objects clearly.
2. a person cannot see the near objects clearly.
3. the near point of the eye gets shifted away from the normal position.
4. the far point of the eye gets shifted towards the eye.
Which of the statements given above are correct?
At the center of earth dt R, value of “g”?
Cp and Cv are specific heats at constant pressure and constant volume respectively. It is observed that Cp – Cv = a for hydrogen gas Cp – Cv = b for nitrogen gas
The correct relation between a and b is :
Hydrogen atom does not emit X-rays because
If the doors of a refrigerator are left open for a few hours, the room temperature will
Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
The lead wires should have
If a body is taken from a pole to the equator its distance from the center of the earth will?
A current flows in a conductor from east to west. The direction of the magnetic Held at a point above the conductor is _______.
Radio telescopes are better than optical telescopes because
What is the minimum thickness of a thin film required for constructive interference in the reflected light from it?
Given, the refractive index of the film = 1.5, wavelength of the light incident on the film = 600 nm.
Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
Two resistance r1 and r2 (r1 < r2 ) are connected in parallel. Their equivalent resistance R is
Electromotive force may be defined as the?
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
The leaning tower of Pisa does not fall because
It is a straight line with –ve slope.
A radioactive nucleus A with a half life T, decays into a nucleus B. At t = 0, there is no nucleus B. At sometime t, the ratio of the number of B to that of A is 0.3. Then, t is given by :
Which law is also called law of inertia ?
Consider the following statements:
Heat produced in a conductor carrying current is independent of
1. Current passing through it.
2. Thermal conductivity.
3. Specific resistance.
Which one of the following statements given above is/are correct ?
It is more difficult to walk on a sandy road than on a concrete road because
A magnetic needle of magnetic moment
6. 7 × 10–2 Am2 and moment of inertia
7. 5 × 10–6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is :
he value of the following is given by 100 (kilo ampere ) x ( micro ampere ) 100 milli ampere * 10 ampere
Of the following properties of a wave, the one that is independent of the other is its
Atmospheric pressure is measured by
If an electric circuit could be compared to a water circuit at a water park, then the current would be analogous to the ____.
If the earth is 1/4th of its present distance from the sun, the duration of the year would be