WBJEE last years question solved paper

Here I am looking for the WBJEE last years question solved paper, will you please provide me the same????????

[Raman Vij]

As per your request here I am sharing the WBJEE last years question solved paper:

WBJEE last years question solved paper

Question 1
Two spherical bodies of mass M and SM and radii R and 2R respectively are released in free space with initial separation between their centres equal to 12 R. If they attract each other due to gravitational force only, then the distance covered by the smaller body just before collision, is:
A 1.SR
B 2.5R
C 4.5R
D 7.5R
Question 2
Acceleration due to gravity isg on the surface of the earth. Then the value of the acceleration due to gravity at a height of 32 km above earth’s surface is (Assume radius of earth to be 6400 km)
A 0.99 g
B 0.8 g
C 1.Olg
D 0.9g
Question 3
A pellet of mass 1 g is moving with an angular velocity of I tad/s along a circle of radius I m the centrifugal force is
A 0.1 dyne
B 1 dyne
C 10 dyne
D 100 dyne
Question 4
One kg of copper is drawn into a wire of 1 mm diameter and a wire of 2 mm diameter. The resistance of the two wires will be in the ratio
A 2:1
B 1:2
C 16:1
D 4:1
Question 5
A piano-convex lens Cf =20 cm) is silvered at plane surface. Now focal length will be
A 20cm
B 40cm
C 30 cm
D 10 cm
Question 6
In an inelastic collision an electron excites a hydrogen atom from its ground state to a M-shell state. A second electron collides instantaneously with the excited hydrogen atom in the M-shell state and ionizes it. At least how much energy the second electron transfers to the atom in the M-shell state?
A + 3.4 eV
B +1.5 1 eV
C —3.4 eV
D —1.51 eV
Question 7
A satellite orbiting the earth In a circular orbit of radius R completes one revolution in 3h. If orbital radius of geostationary satellite is 36,000 km. orbital radius of earth is:
A 6000 km
B 9000km
C 12000 km
D 15000 km
Question 8
A piece of ice is floating in a jar containing water. When the ice melts, then the level of water
A rises
B falls
C remains unchanged
D rises or falls
Question 9
Two point objects of masses 1.5 g and 2.5 g respectively are at a distance of 16 cm apart, the centre of gravity is at a distance x from the objectofmass 1.5gwherexis
A 10cm
B 6cm
C 13cm
D 3cm
Question 10
An electrical cable having a resistance of 0211 delivers 10 kW at 200 V DC to a factory. What is the efficiency of transmission?
A 65%
B 75%
C 85%
D 95%
Question 11
The light beams of intensities in the ratio of 9 : I are allowed to interfere. What will be the ratio of the intensities of maxima and minima?
A 3:1
B 4:1
C 25:9
D 81:1
Question 12
If a person can throw a stone to maximum height of h metre vertically, then the maximum distance through which it can be thrown horizontally by the same person is
A 2/h
B h
C 2h
D 3h
Question 13
A wire can be broken byapplyingaloadof200 N. The force required to break another wire of the same length and same material, but double in diameter, is:
A 200N
B 400N
C 600N
D 800N
Question 14
Band spectrum is also called
A molecular spectrum
B atomic spectrum
C flash spectrum
D line absorption spectrum
Question 15
If the earth shrinks such that its mass does not change but radius decreases to one quarter of tts original value then one complete day will take
A 96 h
B 48h
C 6h
D 1.5 h
Question 16
To write the decimal number 37 in binary, how many binary digits are required?
A 5
B 6
C 7
D 4
Question 17
The ratio of magnetic field and magnetic moment at the centre of a current carrying circular loop is x. When both the current and radius is doubled the ratio will be
A x/8
B x/4
C x/2
D 2x
Question 18
A cricket ball of mass 0.25 kg with speed 10 rn/s collides with a bat and returns with same speed Within 0.01 s. The force acted on bat is
A 25N
B 5ON
C 250 N
D 500 N
Question 19
A body floats in water with 400/o of its volume outside water. When the same body floats in an oil. 60% of its volume remains outside oil. The relative density of oil is
A 0.9
B 1.0
C 1.2
D 1.5
Question 20
Air inside a closed container is saturated with water vapour. The air pressure is p and the saturated vapour pressure of water is . If the mixture is compressed to one-half of its volume by maintaining temperature constant, the pressure becomes
A 2(p-i-p)
B 2p+ji
C (p + ) /2
D p + 2