Question

In the nuclear reaction  is

(a)  

(b)  

(c)  

(d)  

Answer

(c)  

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For the transistor circuit shown below, if b = 100, voltage drop between emitter and base is 0.7 V then value of VCE will be

(a) 10 V

(b) 5 V

(c) 13 V 

(d) 0 V

When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volts. If e/m for the electron is  1.8   the maximum velocity of the ejected electrons is

(a) 6   

(b) 8  

(c) 1.8  

(d) 1.8  

In a region of uniform magnetic induction , a circular coil of radius 30 cm and resistance ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is

(a) mA

(b) 30 mA

(c) 6 mA

(d) 200 mA

According to Lenz's law there is conversion of:

The image distance of an object placed 10 cm in front of a thin lens of focal length + 5 cm is

(a) 6.5 cm

(b) 8.0 cm

(c) 9.5 cm

(d) 10.0 cm

In an amplifier the load resistance   is equal to the plate resistance (. The voltage amplification is equal to

(a) μ

(b) 2 μ

(c) μ/2

(d) μ/4

The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell

(a) 1.2 Ω

(b) 1.3 Ω

(c) 1.1 Ω

(d) 1.4 Ω

There is a current of 20 amperes in a copper wire of  square metre area of cross-section. If the number of free electrons per cubic metre is , then the drift velocity is

(a) 125  

(b) 12.5  

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(d) 1.25  

The molar heat capacity of oxygen gas at STP is nearly 2.5R. As the temperature is increased, it gradually increases and approaches 3.5R. The most appropriate reason for this behaviour is that at high temperatures:
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  2. Oxygen molecules dissociate in atoms.
  3. The molecules collide more frequently.
  4. Molecular vibrations gradually become effective.

The brightness of a bulb will be reduced, if a resistance is connected in

(a) Series with it

(b) Parallel with it

(c) Series or parallel with it

(d) Brightness of the bulb cannot be reduced