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WBJEE Physics Test - 7 - JEE MCQ


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30 Questions MCQ Test WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 - WBJEE Physics Test - 7

WBJEE Physics Test - 7 for JEE 2024 is part of WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 preparation. The WBJEE Physics Test - 7 questions and answers have been prepared according to the JEE exam syllabus.The WBJEE Physics Test - 7 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for WBJEE Physics Test - 7 below.
Solutions of WBJEE Physics Test - 7 questions in English are available as part of our WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 for JEE & WBJEE Physics Test - 7 solutions in Hindi for WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 course. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free. Attempt WBJEE Physics Test - 7 | 40 questions in 60 minutes | Mock test for JEE preparation | Free important questions MCQ to study WBJEE Sample Papers, Section Wise & Full Mock Tests 2025 for JEE Exam | Download free PDF with solutions
WBJEE 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

WBJEE Physics Test - 7 - Question 2

An electron beam is subjected to perpendicular electric and magnetic fields of resectively. If there is no deflection, the velocity of electrons is

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WBJEE Physics Test - 7 - Question 3

X - rays which can penetrate through longer distances in substances are called

WBJEE Physics Test - 7 - Question 4

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 WBJEE Physics Test - 7 - Question 4

On removing the oil, the capacitance of the capacitor will become.

WBJEE Physics Test - 7 - Question 5

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

WBJEE Physics Test - 7 - Question 6

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

WBJEE Physics Test - 7 - Question 7

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

WBJEE Physics Test - 7 - Question 8

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

WBJEE Physics Test - 7 - Question 9

A wire of length L is drawn such that its diameter is reduced to half of its original diameter. If the initial resistance of the wire were 10 Ω, its new resistance would be

WBJEE Physics Test - 7 - Question 10

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

WBJEE Physics Test - 7 - Question 11

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

WBJEE Physics Test - 7 - Question 12

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

WBJEE Physics Test - 7 - Question 13

The effective value of a.c. in a circuit is 10 A. The peak value of current is

WBJEE Physics Test - 7 - Question 14

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

WBJEE Physics Test - 7 - Question 15

Which of the following radiations have the least wavelength?

WBJEE Physics Test - 7 - Question 16

If the electric flux entering and leaving an enclosed surface respectively is φ 1 and φ 2 , the electric charge inside the surface will be

WBJEE Physics Test - 7 - Question 17

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

WBJEE Physics Test - 7 - Question 18

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is

WBJEE Physics Test - 7 - Question 19

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

WBJEE Physics Test - 7 - Question 20

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

WBJEE Physics Test - 7 - Question 21

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

WBJEE Physics Test - 7 - Question 22

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

WBJEE Physics Test - 7 - Question 23

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

WBJEE Physics Test - 7 - Question 24

What is the Q-value of the reaction

The atomic masses of 1H , 4H e and 7L i are 1.007825 u, 4.002603 u and 7.016004 u respectively

WBJEE Physics Test - 7 - Question 25

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

WBJEE Physics Test - 7 - Question 26

What is the stopping potential when the metal with work function 0.6 eV is illuminated with the light of 2 eV ?

WBJEE Physics Test - 7 - Question 27

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

WBJEE Physics Test - 7 - Question 28

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 :

WBJEE Physics Test - 7 - Question 29

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

WBJEE Physics Test - 7 - Question 30

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

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