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# VITEEE Physics Test - 8

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## 35 Questions MCQ Test VITEEE: Subject Wise and Full Length MOCK Tests | VITEEE Physics Test - 8

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VITEEE Physics Test - 8 - Question 1

### An electric motor operates on a 50 volt supply and a current of 12 A. If the efficiency of the motor is 30%, what is the resistance of the winding of the motor

Detailed Solution for VITEEE Physics Test - 8 - Question 1

V = 50 volt; I = 12 ampere
Total power consumed = 50x12 W = 600 W
Since efficiency of motor is 30%, therefore, 70% of power is lost in Joule heating.
If Q is the heat produced, then
Q = 70% of 600 W or Q = 70/100 x 600 W = 420 W
Also, Q = I2R
∴ 420 = (12)2R or R = 420/(12 x 12(    Ω = 2.92 Ω

VITEEE Physics Test - 8 - Question 2

### Photons of energy 1eV and 2.5 eV successively illuminate a metal whose work function is 0.5 eV. The ratio of the maximum speeds of the electrons emitted will be

VITEEE Physics Test - 8 - Question 3

### Energy per unit volume for a capacitor having area A and separation d kept at potential difference V is given by

VITEEE Physics Test - 8 - Question 4
If a wire of resistance R is melted and recasted to half of its length, then the new resistance of the wire will be
VITEEE Physics Test - 8 - Question 5
A laser beam is used for carrying out surgery because it
Detailed Solution for VITEEE Physics Test - 8 - Question 5 As the laser beam is highly monochromatic, directional and coherent, it can be sharply focussed.
Therefore it is used for carrying out surgery
VITEEE Physics Test - 8 - Question 6
Same current is being passed through a copper voltmeter and a silver voltmeter. The rate of increase in weights of the cathode of the two voltmeters will be proportional to
VITEEE Physics Test - 8 - Question 7

In the circuit,the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R will be

VITEEE Physics Test - 8 - Question 8

Given three equal resistors, how many different combination of all the three resistors can be made?

VITEEE Physics Test - 8 - Question 9

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV, its kinetic energy will be

VITEEE Physics Test - 8 - Question 10

In an L-R circuit, time constant is that time in which current grows from zero to the value

VITEEE Physics Test - 8 - Question 11

Lenz's law is a consequence of the law of conservation of

VITEEE Physics Test - 8 - Question 12

Two equal charges q of opposite sign separated by a distance 2a constitute an electric dipole of dipole moment p. If P is a point at a distance r from the centre of the dipole and the line joining centre to this point makes an angle θ with the axis of the dipole, then potential at the point P is given by

VITEEE Physics Test - 8 - Question 13

On moving a charge of 20 C by 2 cm, 2 joule of work is done, then the potential difference between the points is

Detailed Solution for VITEEE Physics Test - 8 - Question 13

W = QV
∴ V = W/Q = 2/20 = 0.1 volt

VITEEE Physics Test - 8 - Question 14

The capacitance of a parallel plate capacitor becomes 4/3 times its original value if a dielectric slab of thickness t = d/2 is inserted between the plates (where d is separation between the plates). The dielectric constant of the slab is

VITEEE Physics Test - 8 - Question 15

Five equal capacitors connected in series have a resultant capacitance of 4 μ F. The total energy stored in these, when these are connected in parallel and charged to 400V is

VITEEE Physics Test - 8 - Question 16

Two point charges of +4 μC and -6 μC are separated by a distance of 20 cm in air. At what point, on the line joining the two charges from charge +4 μC, the electric potential will be zero?

VITEEE Physics Test - 8 - Question 17

A potential difference of 2V exists across a potentiometer wire of 2m length. When the potential difference across a 2Ω resistance of a second circuit is measured by this potentiometer wire, it amounts to 5mm balancing length. The current in the second circuit is

Detailed Solution for VITEEE Physics Test - 8 - Question 17

2.5 mA
Potential gradient in the wire
= 2 2 = 1V/m
P.D. across a balancing length of 5 mm
= 5 x 10-3 x 1
= 5 x 10-3 V
∴ Current in the second circuit
= 5 x 10-3/2 = 2.5 x 10-3 A
= 25 x 10-4 A

VITEEE Physics Test - 8 - Question 18
In a chain reaction uranium atom gets fissioned forming two different materials. Then total weight of these put together is
VITEEE Physics Test - 8 - Question 19

In β + decay process, the following changes take place inside the nucleus

VITEEE Physics Test - 8 - Question 20

An image of the sun is formed by a lens of focal length 30 cm on the metal surface of a photoelectric cell and a photoelectric current (I) is produced. The lens forming the image is then replaced by another of the same diameter but of focal length of 15 cm. The photelectric current in this case is

VITEEE Physics Test - 8 - Question 21

An alpha nucleus of energy 1/2 mv2 bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to

VITEEE Physics Test - 8 - Question 22

Sodium surface is subjected to ultraviolet and infrared radiations separately and the stopping potential of photoelectrons determined. Then the stopping potential is

VITEEE Physics Test - 8 - Question 23

If the luminous intensity of a unidirectional bulb is 100 candela, then total luminous flux emitted from the blub, is

VITEEE Physics Test - 8 - Question 24

In case of a semiconductor which one of the following statements is wrong?

VITEEE Physics Test - 8 - Question 25

A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a

VITEEE Physics Test - 8 - Question 26

Fermi level in an intrinsic semiconductor lies

VITEEE Physics Test - 8 - Question 27

Indium impurity in Germanium makes it into a

VITEEE Physics Test - 8 - Question 28

Platinum and silicon are heated upto 250oC and after then cooled. In the process of cooling

VITEEE Physics Test - 8 - Question 29

Which of the following, when added as an impurity atom in the silicon, produces n-type semiconductor?

VITEEE Physics Test - 8 - Question 30

In a P-N junction diode

VITEEE Physics Test - 8 - Question 31

A Nicol prism can be used

VITEEE Physics Test - 8 - Question 32

A semiconductor is cooled from T₁K to T₂K. Its resistance

VITEEE Physics Test - 8 - Question 33

Which one of the following properties of light does not support wave theory of light?

VITEEE Physics Test - 8 - Question 34
Inverse square law of intensity (illuminance) is valid for
VITEEE Physics Test - 8 - Question 35

When exposed to sunlight, thin films of oil on water often exhibit brilliant colours due to the phenomenon of

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