Physics Test - 10

Two deuterium nuclei each of mass 'm' fuse to form a helium nucleus resulting in release of energy E. then the mass of helium nucleus formed will be

A particle of charge q, mass m and energy E has de-Broglie wavelength λ. For a particle of charge 2q, mass 2m and energy 2E, the de-Broglie wavelength is 

A convex lens of focal length 20 cm is cut into two equal parts so as to obtain two plano convex lenses as shown in the fig (a). The two parts are then put in contact as shown in fig(b). The focal length of the combination is

The polariser and analyser are inclined to each other at 60°. The intensity of the unpolarised light incident on the polariser is:

An inductor of reactance 1 and a resistor of 2 are connected in series to the terminals of a 6 V (rms) a.c. source. The power dissipated in the circuit is

The reverse bias in a junction diode is changed from 5V to 15V then the value of current changes from 38μ A to 88μ A. The resistance of junction diode will be

Logic gates X and Y have the truth tables shown below

when the output of X is connected to the input of Y, the resulting combination is equivalent to a single

An aeroplane of mass M requires a speed V for take-off. The length of the runway is S and the coefficient of friction between the tyres and the ground is μ. Assuming that the plane accelerates uniformly during the take-off the minimum force required by the engine of the plane for take-off is given by

The efficiency of a transformer is 98%. The primary voltage and current are 200 V and 6 A. If the secondary voltage is 100 V, the secondary current is

A message signal of frequency 50/π kHz and peak voltage of 5 V is used to modulate a carrier of frequency 1 MHz and peak voltage 20 V. The modulation index is