Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is
|
(a) 10-3 N |
(b) 2.5 ×10-3 N |
(c) Zero |
(d) 1.5 × 10-3 N |
(c) Zero
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What will be the height of image when an object of 2 mm is placed on the axis of a convex mirror at a distance 20 cm of radius of curvature 40 cm
|
(a) 20 mm |
(b) 10 mm |
(c) 6 mm |
(d) 1 mm |
A parallel combination of two resistors, of 1W each, is connected in series with a 1.5 W resistor. The total combination is connected across a 10 V battery. The current flowing in the circuit is
|
(a) 5 A |
(b) 20 A |
(c) 0.2 A |
(d) 0.4 A |
A chain reaction is continuous due to
|
(a) Large mass defect |
|
(b) Large energy |
|
(c) Production of more neutrons in fission |
|
(d) None of these |
Number of electrons in one coulomb of charge will be
|
(a) 5.46 |
(b) 6.25 |
(c) 1.6 |
(d) 9 |
A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now swings through the field, the pendulum will
|
(a) Keep oscillating with the old time period |
|
(b) Keep oscillating with a smaller time period |
|
(c) Keep oscillating with a larger time period |
|
(d) Come to rest very soon |
he half-life of a radioactive substance is 48 hours. How much time will it take to disintegrate to its 
th part
|
(a) 12 h |
(b) 16 h |
(c) 48 h |
(d) 192 h |
The potential difference in open circuit for a cell is 2.2 volts. When a 4 ohm resistor is connected between its two electrodes the potential difference becomes 2 volts. The internal resistance of the cell will be
|
(a) 1 ohm |
(b) 0.2 ohm |
(c) 2.5 ohm |
(d) 0.4 ohm |
