Physics MCQ Set 6

Question : Capacitance of a capacitor is directly proportional to

1. Area of the plates
2. Separation between the plates
3. Force between the two plates
4. Thickness of the plates

Question : The force between two charges is 28N. If the paraffin wax of relative permitivity 2.8 is introduced between the charges as a medium then the force reduces to

1. 25N
2. 20N
3. 15N
4. 10N

Question : We can decrease the capacitance of a parallel plate capacitor by

1. Decreasing the area of the plate
2. Increasing the distance between them
3. Using the dielectric of a lower permitivity
4. All the above

Question : In a parallel combination of resistor the equivalent resistance will be

1. Smaller then the smallest resistance in parallel
2. Larger than the largest resistance in parallel
3. Equal to the largest resistance in parallel
4. Equal to the smallest resistance in parallel

Question : Resistance of a semi conductor

1. Decrease with increase of temperature
2. Increase with increase of temperature
3. Remains constant with increase of temperature
4. Reduces to zero with increase of temperature

Question : Choose the correct statement: The amount of heat developed in a conductor is directly proportional to

1. The resistance of the conductor
2. The square of the current in the conductor
3. The time for which the current is passed
4. All of these