The cathode of a diode valve is replaced by another cathode of double the surface area. Keeping the voltage and temperature conditions the same, will the plate current decrease, increase or remain the same?

A cyclist doubles his speed. How will his kinetic energy change : increases, decreases or remains the same ?

A parallel -plate capacitor is connected to a battery that maintains a constant potential difference V between the plates. If the plates are pulled away from each other, increasing their separation, does the magnitude of the charge on the plates (a) increase, (b) decrease, or (c ) remain the same ?

A series circuit consists of three identical lamps connected to a battery as shown in Fig. 7.13 . when the switch S is closed, what happens (a) to the intensities of lamps A and B , (b) to the intensity of lamp C , ( c ) to the current in the circuit , and (d) to the voltage drop across the three lamps ? Does the power dissipated in the circuit increase, decrease, or remain the same ?

A container having some gas was kept in a moving train. The temperature of the gas in the container will A. increase slightly B. decrease C. remain the same D. become infinite

There is a hole in the middle of a copper plate . When heating the plate , diameter of hole would a) always increase b) always decrease c) remains the same d) none of these

The capacitance of a parallel plate capacitor when a very thin metallic sheet is placed in the space between the plates, parallel to the plates , will (1) Increase (2) Decreases (3) Remain same (4) Nothing can be said

Two plates of equal areas are placed in contact wih each other. Their thickness are 2.0 cm and 5.0 cm respectively. The temperature of the external surface of the first plate is -20^(@)C and that of the external surface of the second plate is 20^(@)C . What will be the temperature of the current surface if the plates (i) are of the same material, (ii) have thermal conductivities in the ratio 2:5 .

The temperature of a body is doubled but the rate fo theat radiaton remains same due to change in its surface area. The ratio of initial area to final area is

STATEMENT-1 : In a meter bridge, if its wire is replaced by another wire having same length, same material but twice the cross sectional area, then the accuracy of measurement decreases. and STATEMENT-2 : Accuracy of meter bridge depends on the length of wire.