A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it
Atmospheric pressure is measured by
The sun is seen before the actual sunrise because of __________.
On a rainy day, small oil films on water show brilliant colours. This is due to
A liquid drop tends to assume a spherical shape because of
Consider the following statements. Work is not done, when:
1. a man is walking on a horizontal road.
2. a man is climbing up a hill.
3. a man with a load on his head is walking on a horizontal road.
4. moon is revolving round the earth.
Which of the statements given above are correct?
The maximum current that can be measured.by a galvenometer of resistance 400 is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is (in ohm).
Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohms; 60 ohms and 100 ohms respectively. The effective resistance between the points A and B in ohms will be
Which of the following properties is not possible in case of X-rays?
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
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 of the following statements is/are true regarding a light wave travelling from air to glass?
1. Its frequency remains unchanged.
2. Its speed changes.
Select the correct answer using the codes given below:
The motion of falling bodies towards earth is due to the?
ln which of the processes, does the internal energy of the system remain constant?
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) ?
Lognitudinal waves and Transverse waves are types of ?
When a body is immersed partly or wholly in a liquid, there is an apparent loss in weight of the body which is equal to the weight of liquid displaced by the body.
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
All electrical appliances are connected in parallel to each other between the main line and the neutral wire to get?
A man inside a moving train tosses a coin, the coin falls behind him. The train is moving
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?
The weight of an object in a satellite orbiting around the earth is?
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
Minimum number of unequal vectors which can give zero resultant are
Three liquids of equal masses are taken in three identical cubical vessels A, B and C. Their densities are PA, PB and PC respectively. But PA < PB < PC. The force exerted by the liquid on the base of the cubical vessel is ______
On a stationary sail boat, air is blown from a fan attached to the boat. The boat
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be :