Physics Test - ...

When an electron-positron pair annihilates, how much energy is released?

Directions: In the following question, a statement of Assertion is given, followed by a corresponding statement of Reason. Mark the correct answer as:

(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

(b) If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.

(c) If Assertion is true, but Reason is false.

(d) If both Assertion and Reason are false.

Assertion : Neutrons penetrate a matter more readily as compared to protons.

Reason : Neutrons are slightly more massive than protons.

If M0 is the mass of an oxygen isotope 8O17, and Mp and Mn are the masses of a proton and a neutron, respectively, then what is the nuclear binding energy of the isotope

A shell at rest, at the origin explodes into three fragments of masses 1 kg, 2 kg and m kg. The pieces weighing 1 kg and 2 kg fly off with a speed of 5 ms–1along x– axis and 6 ms–1along y– axis respectively. If the 'm' kg piece flies off with a speed of 6.5 ms–1, what must be the total mass of the shell?

A nucleus decays by β +emission, followed by γ-emission. If the atomic and mass numbers of the parent nucleus are Z and A, respectively, then the corresponding numbers for the daughter nucleus are

P and Q are like parallel forces. If P is moved parallel to itself through a distance x, then the resultant of P and Q moves through a distance:

An engine pumps up 100 kg of water through a height of 10 m in 5s. Given that the efficiency of engine is 60%. If g = 10 ms^-2, the power of the engine is :

During projectile motion, the horizontal velocity

In the circuit given below, an A.C. voltage V = 220 volt (r.m.s.) is applied. The maximum voltage across the capacitor will be

For a transistor, the current gain α is 0.96. It is used as an amplifier in a common base circuit with a load resistance of 4 kΩ. If the dynamic resistance of the emitter-base junction is 48Ω, then the voltage gain is

The depletion layer in a p-n junction diode is 10-6m wide and its knee potential is 0.5 V. What is the inner electric field in the depletion region?

Of the diodes shown in the following diagrams, which one is reverse biased?

For the given circuit to act as a full-wave rectifier, the AC input should be connected across ..i... and ..ii... and the DC output should appear across ...iii... and ...iv....

i, ii, iii and iv, respectively, are

Two particles start simultaneously from the same point and move along two straight lines, one with uniform velocity  and the other from rest with uniform acceleration  Let α be the angle between their directions of motion. The relative velocity of the second particle w.r.t. first is least after a time of