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# VITEEE Physics Test - 7

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## 35 Questions MCQ Test VITEEE: Subject Wise and Full Length MOCK Tests | VITEEE Physics Test - 7

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VITEEE Physics Test - 7 - Question 1

### In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45o, the value of inductive reactance will be

VITEEE Physics Test - 7 - Question 2

### An electron beam is subjected to perpendicular electric and magnetic fields of 5 x 10-4 wbm-2 and 3 x 103 V m-1 resectively. If there is no deflection, the velocity of electrons is

VITEEE Physics Test - 7 - Question 3

### The quantity of electricity needed to liberate one gram equivalent of an element is

VITEEE Physics Test - 7 - Question 4

Consider telecommunication through optical fibres. Which of the following statements is not correct

VITEEE Physics Test - 7 - Question 5

A parallel plate condenser with oil between the plates (dielectric constant of oil K = 2) has a capacitance C. If the oil is removed, then capacitance of the capacitors becomes

Detailed Solution for VITEEE Physics Test - 7 - Question 5

On removing the oil, the capacitance of the capacitor will become.
C ′ = C/K = C/2

VITEEE Physics Test - 7 - Question 6

The temperature coefficient of resistivity of material is 0.0004/K. When the temperature of the material is increased by 50 oC , its resistivity increases by 2 x 10-8  ohm -meter. The initial resistivity of the material in ohm-meter is

VITEEE Physics Test - 7 - Question 7

A transformer is used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5A, the efficiency of the transformer is approximately

VITEEE Physics Test - 7 - Question 8

If the length of the wire is doubled and its area of cross section is decreased to half, then its resistance

VITEEE Physics Test - 7 - Question 9

A microammeter has a resistance of 100 Ω and full scale range of 50 μA. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination

VITEEE Physics Test - 7 - Question 10

The expected energy of the electrons at the absolute zero is called

VITEEE Physics Test - 7 - Question 11

In a current carrying long solenoid, the field produced does not depend upon

VITEEE Physics Test - 7 - Question 12

Which of the following radiations have the least wavelength?

VITEEE Physics Test - 7 - Question 13

Equal charges are given to two conducting spheres of different radii. The potential will

VITEEE Physics Test - 7 - Question 14

A charged particle begins to move from the origin in a region which has a uniform magnetic field in the x-direction and a uniform electric field in the y-direction. Its speed is ν, when it reaches the point (x,y,z). The speed (ν) will depend upon

VITEEE Physics Test - 7 - Question 15

Two charges -10 C and + 10 C are placed 10cm apart. Potential at the centre of the line joining two charges is

VITEEE Physics Test - 7 - Question 16

The capacitor of a parallel plate capacitor with no dielectric substance and a separation of 0.4 cm is 2 μF. The separation is reduced to half and it is filled with a substance of dielectric value 2.8. The new capacity of the capacitor is

VITEEE Physics Test - 7 - Question 17

The path of particle moving under the influence of a force fixed in magnitude and direction is

VITEEE Physics Test - 7 - Question 18

In radioactive decay process, the negatively charged emitted β -particles are

VITEEE Physics Test - 7 - Question 19

What is the Q-value of the reaction
p + 7Li → 4He + 4He
The atomic masses of 1H , 4He and 7Li are 1.007825 u, 4.002603 u and 7.016004 u respectively

VITEEE Physics Test - 7 - Question 20
What is the stopping potential when the metal with work function 0.6 eV is illuminated with the light of 2 eV ?
VITEEE Physics Test - 7 - 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 - 7 - Question 22
The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately
VITEEE Physics Test - 7 - Question 23
Time of exposure for a photographic print is 10 second, when a lamp of 50 Cd is placed at 1 m from it. Then another lamp of luminous intensity I is used, and is kept at 2 m from it. If the time of exposure now is 20 s, the value of I in (in Cd) is :
VITEEE Physics Test - 7 - Question 24

Two plane mirrors inclined to each other at an angle 72o , what is the number of images formed?

VITEEE Physics Test - 7 - Question 25

The minimum potential difference between the base and emitter required to switch a silicon transistor 'ON' is approximately

VITEEE Physics Test - 7 - Question 26

Energy gap in a metal is

VITEEE Physics Test - 7 - Question 27

In a P-type semiconductor the electrical conduction is due to

VITEEE Physics Test - 7 - Question 28

A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly

VITEEE Physics Test - 7 - Question 29

In intrinsic semiconductor at room temperature, number of electrons and holes are

VITEEE Physics Test - 7 - Question 30

The p-n junction diode is used as

VITEEE Physics Test - 7 - Question 31

When Ge crystal are doped with phosphorus atom then it becomes

VITEEE Physics Test - 7 - Question 32

Light was producing interference have their amplitudes in the ratio 3:2. The intensity ratio of maximum and minimum of interference fringes is

VITEEE Physics Test - 7 - Question 33

The ray of light

VITEEE Physics Test - 7 - Question 34

For which property are electrons used in an electron microscope?

VITEEE Physics Test - 7 - Question 35

According to wave theory, light is a form of energy which travels through a medium in the form of

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