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WBJEE Phy & Chem Sample Paper - JEE MCQ


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30 Questions MCQ Test - WBJEE Phy & Chem Sample Paper

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

One Kg of copper is drawn into a wire of 1mm diameter and a wire of 2 mm diameter. The resistance of the two wires will be in the ratio

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WBJEE Phy & Chem Sample Paper - Question 2

An electrical cable having a resistance of 0.2 : delivers 10kw at 200V D.C. to a factory. What is the efficiency of transmission?

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WBJEE Phy & Chem Sample Paper - Question 3

A wire of resistance 5Ω is drawn out so that its new length is 3 times its original length.What is the reistance of the new wire?

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WBJEE Phy & Chem Sample Paper - Question 4

Two identical cells each of emf E and internal resistance r are connected in parallel with an external resistance R. To get maximum power developed across R, the value of R is

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For max. power consumption. I should be max. So denominator should be min. for that

WBJEE Phy & Chem Sample Paper - Question 5

To write the decimal number 37 in binary, how many binary digits are required?

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              (100101) ⇒ 6 digits

WBJEE Phy & Chem Sample Paper - Question 6

A junction diode has a resistance of 25Ω when forward biased and 2500Ω when reverse biased. The current in the diode, for the arrangement shown will be

Detailed Solution for WBJEE Phy & Chem Sample Paper - Question 6

Req = 25 + 10 = 35Ω
Because diode is forward biased. So  

WBJEE Phy & Chem Sample Paper - Question 7

If the electron in a hydrogen atom jumps from an orbit with level n1 = 2 to an orbit with level n2 = 1 the emitted radiation has a wavelength given by

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WBJEE Phy & Chem Sample Paper - Question 8

What is the particle x in the following nuclear reaction:
 

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Hence X represents neutron 

WBJEE Phy & Chem Sample Paper - Question 9

An alternating current of rms value 10 A is passed through a 12Ω resistor. The maximum potential difference across the resistor is

Detailed Solution for WBJEE Phy & Chem Sample Paper - Question 9

Irms = 10A

WBJEE Phy & Chem Sample Paper - Question 10

Which of the following relation represent Biot-Savart’s law?

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WBJEE Phy & Chem Sample Paper - Question 11

 are two vectors given by   The magnitude of the component of  is 

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Magnitude of components of  

WBJEE Phy & Chem Sample Paper - Question 12

Given   What is the angle between  

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C will be perpendicular to plane  axb  in let upward direction
D will be perpendicular to plane  bxa  in  downward  direction
so angle between C and D will 180

WBJEE Phy & Chem Sample Paper - Question 13

The acceleration ‘a’ (in ms–2) of a body, starting from rest varies with time t (in s) following the equation a = 3t + 4 The velocity of the body at time t = 2s will be

Detailed Solution for WBJEE Phy & Chem Sample Paper - Question 13

a = 3t + 4

WBJEE Phy & Chem Sample Paper - Question 14

Figure below shows the distance-time graph of the motion of a car. If follows from the graph that the car is

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Slope is increasing with constant rate. i.e motion is uniformaly accelerated

WBJEE Phy & Chem Sample Paper - Question 15

Two particles have masses m & 4m and their kinetic energies are in the ratio 2: 1. What is the ratio of their linear momenta ?

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WBJEE Phy & Chem Sample Paper - Question 16

The force F acting on a particle moving in a straight line is shown below. What is the work done by the force on the particle in the 1st meter of the trajectory ? 

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Work done in 1 meter = area of shaded curve = 1/2 × 1×5 =2.5 J

WBJEE Phy & Chem Sample Paper - Question 17

If the kinetic energy of a body changes by 20% then its momentum would change by –

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Therefore % increase = 9.5%

WBJEE Phy & Chem Sample Paper - Question 18

A bullet is fired with a velocity u making an angle of 60° with the horizontal plane. The horizontal component o the velocity of the bullet when it reaches the maximum height is

Detailed Solution for WBJEE Phy & Chem Sample Paper - Question 18

Horizontal velocity would be constant so the value of velocity at the highest point will be u/2

WBJEE Phy & Chem Sample Paper - Question 19

A particle is projected at 60° to the horizontal with a kinetic energy K. The kinetic energy at the highest point is 

Detailed Solution for WBJEE Phy & Chem Sample Paper - Question 19

At highest point kinetic energy = 1/2m (v cos 60°)2 = 1/4 × 1/2m v2 = K/4

WBJEE Phy & Chem Sample Paper - Question 20

The poisson’s ratio of a material is 0.5. If a force is applied to a wire of this material, there is a decrease in the cross-sectional area by 4%. The percentage increase in the length is :

Detailed Solution for WBJEE Phy & Chem Sample Paper - Question 20

Poisson ratio = 0.5
Therefore density is constant hence change in volume is zero we have

That is 4%

WBJEE Phy & Chem Sample Paper - Question 21

Two spheres of equal masses but radii r1 and r2 are allowed to fall in a liquid of infinite column. The ratio of their terminal velocities is

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WBJEE Phy & Chem Sample Paper - Question 22

Two massless springs of force constants K1 and K2 are joined end to end. The resultant force constant K of the system is

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WBJEE Phy & Chem Sample Paper - Question 23

A spring of force constant k is cut into two equal halves. The force constant of each half is

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As 
K' =  2K

WBJEE Phy & Chem Sample Paper - Question 24

Two rods of equal length and diameter have thermal conductivities 3 and 4 units respectively. If they are joined in series, the thermal conductivity of the combination would be

Detailed Solution for WBJEE Phy & Chem Sample Paper - Question 24

In series R = R1 + R2

WBJEE Phy & Chem Sample Paper - Question 25

19 g of water at 30° C and 5 g of ice at – 20° C are mixed together in a calorimeter. What is the final temperature of the mixture? Given specific heat of ice = 0.5 cal g–1(°C)–1 and latent heat of fusion of ice = 80 cal g–1

Detailed Solution for WBJEE Phy & Chem Sample Paper - Question 25

5 × .5 × 20 + 5 × 80 + 5t = 19 × 1 × (30 – t)
t = 5°C

WBJEE Phy & Chem Sample Paper - Question 26

. It is difficult to cook rice in an open vessel by boiling it at high altitudes because of

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At high altitude pressure is low and boiling point also low

WBJEE Phy & Chem Sample Paper - Question 27

The height of a waterfall is 50 m. If g = 9.8 ms–2 the difference between the temperature at the top and the bottom of the waterfall is:

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WBJEE Phy & Chem Sample Paper - Question 28

The distance between an object and a divergent lens is m times the focal length of the lens. The linear magnification produced by the lens is

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u = – mf

WBJEE Phy & Chem Sample Paper - Question 29

A 2.0 cm object is placed 15 cm in front of a concave mirror of focal length 10 cm. What is the size and nature of the image?

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WBJEE Phy & Chem Sample Paper - Question 30

A beam of monochromatic blue light of wavelength 4200 Å in air travels in water of refractive index 4/3. Its wavelength in water will be:

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