If the earth is 1/4th of its present distance from the sun, the duration of the year would be
A piece of ice is floating in a beaker containing water. When whole of the ice melts
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
A body of mass 5 kg is thrown vertically up with a kinetic energy of 490 J. The height at which the kinetic energy of the body becomes half of the original value is ______.
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
In Young's double slit experiment, a third slit is made in between the double slits. Then
In amplitude modulation, sinusoidal carrier
frequency used is denoted by c and the signal frequency is denoted by m. The bandwidth (m) of the signal is such that m << c. Which of the following frequencies is not contained in the modulated wave ?
Siphon will fail to work if
Two cells each of emf E and internal resistance r are connected parallel across a resistor R. The power dissipated in the resistor is maximum if
An astronaut on a strange planet finds that acceleration due to gravity is twice as that on the surface of Earth. Which of the following could explain this?
A thin uniform, circular ring is rolling down an inclined plane of inclination 30° without slipping. Its linear acceleration along the inclined plane will be
Which law is also called law of inertia ?
Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
(i) Diffusion
(ii) Refraction
(iii) Internal reflection
Consider the following statements :
1. If a piece of bar magnet is broken into two
equally long pieces, the pieces will not lose the magnetic properties.
2. Magnetic properties of a substance lie in the atomic level.
Which of the statements given above is/are correct ?
Mach number is used in connection with the speed of
Consider the following statements :
The fraction of a ball floating inside the liquid depends upon
1. density of the liquid
2. mass of the ball
3. density of the ball
Which of the statements given above are correct?
The force of gravity on a body varies slightly from place to place on the earth for two reason. (i) shape of earth and (ii) ?
The resistance of a conductor increases for a given material at ‘constant temperature when?
Which one of the following statements is not true for a person suffering from hypermetropia?
Newton apply Huygens’s formula to calculate?
Given below are two statements:
Assertion (A): Universe is expanding.
Reason (R): The result is based on red shift of spectra of galaxies.
The escape velocity from earth is 11.2 km per sec. If a body is to be projected in a direction making an angle 45° to the vertical, then the escape velocity is
Kicked or thrown balls, jumping animals, object thrown from a window, a missile shot from a gun, a bomb released from a bomber plane, etc are all example of?
A planet is moving around the Sun in a circular orbit of circumference C. The work done on the planet by the gravitational force F of the Sun is