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WBJEE Physics Test - 1 - JEE MCQ


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30 Questions MCQ Test - WBJEE Physics Test - 1

WBJEE Physics Test - 1 for JEE 2024 is part of JEE preparation. The WBJEE Physics Test - 1 questions and answers have been prepared according to the JEE exam syllabus.The WBJEE Physics Test - 1 MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for WBJEE Physics Test - 1 below.
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WBJEE Physics Test - 1 - Question 1

Energy, when one milligram mass is converted in to energy (in joules ) is

Detailed Solution for WBJEE Physics Test - 1 - Question 1

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WBJEE Physics Test - 1 - Question 2

An ammeter with internal resistance 90Ω reads 1.85 A when connected in a circuit containing a battery and two resistors 700Ω and 410Ω in series. Actual current will be

Detailed Solution for WBJEE Physics Test - 1 - Question 2

Ammeter has it's internal resistance, due to which resistance of system inscreases I∝1/Req so current reading decreases that original.
In general, ammeter always reads less than the actual value because of its  Resistance.
Actual current will be Greater than 1.85 A

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WBJEE Physics Test - 1 - Question 3

An ammeter gives full deflection when a current of 2 amp. flows through it. The resistance of ammeter is 12 ohms. If the same ammeter is to be used for measuring a maximum current of 5 amp., then the ammeter must be connected with a resistance of

WBJEE Physics Test - 1 - Question 4

Two similar wires under the same load yield elongation of 0.1 mm and 0.05 mm respectively. If the area of cross-section of the first wire is 4 mm2, then the area of cross section of the second wire is

WBJEE Physics Test - 1 - Question 5

The mutual inductance of an induction coil is 5 H. In the primary coil, the current reduces from 5 A to zero in 10-3s. What is the induced emf in the secondary coil ?

Detailed Solution for WBJEE Physics Test - 1 - Question 5

WBJEE Physics Test - 1 - Question 6

There is a uniform electric field of strength 103 V m−1 along Y-axis. A body of mass 1 gm and charge 10− 6C is projected into the field from orgin along the positive X-axis with a velocity of 10 m s − 1 . Its speed in m s−1 after 10s is (Neglect graviation )

Detailed Solution for WBJEE Physics Test - 1 - Question 6

WBJEE Physics Test - 1 - Question 7

Which of the following quantities does not depend upon the orbital radius of the satellite 

WBJEE Physics Test - 1 - Question 8

The centripetal acceleration of a body moving in a circle of radius 100 cm with a time period of 2s will be

Detailed Solution for WBJEE Physics Test - 1 - Question 8

100cm=1m

a=v²/r

v= 2πr/t

v=6.28/2

v= 3.14

a= 9.8596/1

a=9.8596 m/s²

WBJEE Physics Test - 1 - Question 9

A capacitor of capacity C1 is charged upto V volt and then connected to an unchanged capacitor of capacity C2. The potential difference across each capacitor will be

Detailed Solution for WBJEE Physics Test - 1 - Question 9

Charge on first capacitor = q1 = C11
Charge on second capacitor = q2 = 0
When they are connected, in parallel the total charge
q = q1 + q2
∴ q = C11
and capacitance, C = C1 + C2
Let V' be the common potential difference across each capacitaor, then q = CV'

WBJEE Physics Test - 1 - Question 10

The coil of a moving coil galvanometer is wound over a metal frame in order to

WBJEE Physics Test - 1 - Question 11

If a bar magnet of moment μ is suspended in a uniform magnetic field B and it is given an angular deflection ' θ ' w.r.t its equilibrium position, the restoring torque on magnet is

WBJEE Physics Test - 1 - Question 12

The coil in the tangent galvanometer must be kept

WBJEE Physics Test - 1 - Question 13

Two mercury drops with radii in the ratio of 3 : 4 fall from a great height through the viscous liquid. The ratio of their terminal velocities is

WBJEE Physics Test - 1 - Question 14

The x and y coordinates of a particle at any time t are by x=7t+4t2 and y=5t, where x and y are in metre and t in seconds. The acceleration of particle at t=5 s is

Detailed Solution for WBJEE Physics Test - 1 - Question 14

Explanation:

Given:
- x = 7t + 4t^2
- y = 5t

Acceleration of the particle can be found by taking the second derivative of the position function with respect to time.

First, find the velocity components:
- Vx = dx/dt = d(7t + 4t^2)/dt = 7 + 8t
- Vy = dy/dt = d(5t)/dt = 5

Now, find the acceleration components:
- Ax = dVx/dt = d(7 + 8t)/dt = 8
- Ay = dVy/dt = d(5)/dt = 0

The total acceleration is given by:
- A = sqrt[(Ax)^2 + (Ay)^2] = sqrt[(8)^2 + (0)^2] = 8 m/s^2

Therefore, the acceleration of the particle at t=5s is 8 m/s^2, which corresponds to option B.

WBJEE Physics Test - 1 - Question 15

A bullet is fired from a gun with a velocity of 1000 m−s-1 in order to hit a target 100 m away. At what height above the target should the gun be aimed? (Resistance of air is negligible and g = 10 m−s⁻2)

WBJEE Physics Test - 1 - Question 16

The centripetal acceleration is given by

WBJEE Physics Test - 1 - Question 17

Two radioactive substances A and B have decay constants 5 λ and λ respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be after a time interval

WBJEE Physics Test - 1 - Question 18

The length of a simple pendulum is increased by 1%. Its time period will

WBJEE Physics Test - 1 - Question 19

One-fourth length of a spring of force constant K is cut away. The force constant of the remaining spring will be

WBJEE Physics Test - 1 - Question 20

A solid cylinder of mass M and radius R rolls on a flat surface. Its moment of inertia about the line of contact is

WBJEE Physics Test - 1 - Question 21

Which of the following spectrum has high to low frequency range?

WBJEE Physics Test - 1 - Question 22

A soild sphere, disc and solid cylinder all of the same mass and made of the same material are allowed to roll down (from rest) on an inclined plane, then

WBJEE Physics Test - 1 - Question 23

In forward biasing of junction diode, the width of depletion layer

WBJEE Physics Test - 1 - Question 24

In p-type semiconductor, majority current carriers are

Detailed Solution for WBJEE Physics Test - 1 - Question 24

In a ptype semiconductor, the majority charge carriers are the holes whereas in the n- type semiconductor, the majority charge carriers are the free electrons.

WBJEE Physics Test - 1 - Question 25

Heat given to a body which rises its temperature by 1ºC is

WBJEE Physics Test - 1 - Question 26

The length and breadth of a metal sheet are 3.124 m and 3.002 m respectively. The area of this sheet up to four correct significant figures is

WBJEE Physics Test - 1 - Question 27

The vector     lies in the plane of vectors which of the following is correct ?

WBJEE Physics Test - 1 - Question 28

Doppler's effects in sound and light are

WBJEE Physics Test - 1 - Question 29

Two springs, having spring constants of 25 N-m⁻1 and 16 N-m⁻1are stretched by forces F₁ and F₂.If work done in stretching the springs is equal, then the ratio of the forces F₁ and F₂ is

Detailed Solution for WBJEE Physics Test - 1 - Question 29

WBJEE Physics Test - 1 - Question 30

An unknown resistance X is connected in the left gap and a known resistance R in the right gap of a meter bridge. The balance point is obtained at 55 cm from the left end of the wire. When R is increased by 5 Ω , the balance point shifts by 5 cm. The value of X is

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