A charge 
exerts some force on a second charge 
. If third charge 
is brought near, the force of exerted on
|
(a) Decreases |
|
(b) Increases |
|
(c) Remains unchanged |
|
(d) Increases if |
(c) Remains unchanged
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Voltmeters V1 and V2 are connected in series across a D.C. line. V1 reads 80 volts and has a per volt resistance of 200 ohms. V2 has a total resistance of 32 kilo ohms. The line voltage is
|
(a) 120 volts |
(b) 160 volts |
(c) 220 volts |
(d) 240 volts |
Given below are four logic gate symbol (figure). Those for OR, NOR and NAND are respectively
|
(a) 1, 4, 3 |
(b) 4, 1, 2 |
(c) 1, 3, 4 |
(d) 4, 2, 1 |
A vertical wire kept in Z-X plane carries a current from Q to P (see figure). The magnetic field due to current will have the direction at the origin O along
|
(a) OX |
(b) |
(c) OY |
(d) |
An electron experiences a force equal to its weight when placed in an electric field. The intensity of the field will be
|
(a) 1.7 |
(b) 5.0 |
(c) 5.5 |
(d) 56 N/C |
A normally incident ray reflected at an angle of 90°. The value of critical angle is
|
(a) 45° |
(b) 90° |
(c) 65° |
(d) 43.2° |
Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases are 9 ohm and 2 ohm respectively. Then the resistances of the component resistors are
|
(a) 2 ohm and 7 ohm |
(b) 3 ohm and 6 ohm |
(c) 3 ohm and 9 ohm |
(d) 5 ohm and 4 ohm |
A potentiometer consists of a wire of length 4 m and resistance 10 W. It is connected to cell of emf 2 V. The potential difference per unit length of the wire will be
|
(a) 0.5 V/m |
(b) 10 V/m |
(c) 2 V/m |
(d) 5 V/m |
A star emitting radiation at a wavelength of 5000 Å is approaching earth with a velocity of 1.5
. The change in wavelength of the radiation as received on the earth, is
|
(a) 25 Å |
(b) Zero |
(c) 100 Å |
(d) 2.5 Å |
