A semiconductor has an electron concentration of per
and a hole concentration of
per
. The electron mobility is 25000
and the hole mobility is 100
. Then,
1. the semiconductor is n-type
2. the conductivity is 320 m mho
Three identical capacitors A, B and C are charged to the same potential and then made to discharge through three resistance . Their potential differences (V) are plotted against time t, giving the curves 1, 2 and 3. Choose the incorrect option.
1.
2.
3.
4. None of the above.
1. | wide, and is flanked by alternate dark and bright bands of decreasing intensity |
2. | narrow, and is flanked by alternate dark and bright bands of equal intensity |
3. | wide, and is flanked by alternate dark and bright bands of equal intensity |
4. | narrow and is flanked by alternate dark and bright bands of decreasing intensity |
The logic circuit as shown below has the input waveforms A and B as shown. Pick out the correct output waveform.
1.
2.
3.
4.
Direction: In each of the following questions, a Statement of assertion is given followed by a corresponding Statement of reason.
Assertion (A) Linear momentum of a body changes even when it is moving uniformly in a circle.
Reason (R) In uniform circular motion velocity remains constant.
1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Direction: In each of the following questions, a Statement of assertion is given followed by a corresponding Statement of reason.
Assertion (A) Conductors having equal positive charge and volume, must also have same potential.
Reason (R) Potential depends only on charge and volume of conductor.
1. Both assertion and reason are true and reason is the correct explanation of assertion
2. Both assertion and reason are true but reason is not the correct explanation of assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false