Physics Test - ...

Two rods of the same length and diameter having thermal conductivities K₁ and K₂ are joined in parallel. The equivalent thermal conductivity of the combination is

The number of turns of primary and secondary coils of a transformer is 5 and 10 respectively and mutual inductance of the transformer is 25 H. Now, the number of turns in primary and secondary are made 10 and 5 respectively. Mutual inductance of transformer will be

A candle placed 25cm from a lens forms an image on a screen placed 75cm on the other side of the lens. The focal length and type of the lens should be

A cell of emf E is connected across a resistance R. The potential difference between the terminals of the cell is found to be V. The internal resistance of the cell must be -

Equivalent resistance between A and B is-

A particle is moving in circular path clockwise as shown with decreasing speed. When it is at point A. the direction of its acceleration may be given as

What would be the magnetic field produced due to a long straight wire carrying 3 A current at a point 1/2m away from it?

For small areas of the orifice, the velocity of efflux of a liquid through an orifice in the bottom of the tank  depend upon,

In vertical circular motion, the ratio of kinetic energy of a particle at highest point to that at lowest point is

A ball is dropped from a height of 20 cm. Ball rebounds to a height of 10 cm. What is the loss in energy?