West Bengal Joint Entrance Examinations Board organizes WBJEE Exam for those aspirants who want to get admission in B.Tech/ B.Arch/ B.Pharm etc courses

WBJEE Model Question Papers

Ques:1. In which following triploblastic animal coelom is absent ?
1. Platyhelminthes
2. Aschelminthes
3. Annelids
4. Arthropods
Answer: 4

Ques:2. Two mirrors at an angle θº produce 5 images of a point. The number of images produced when θ is decreased to θº – 30º is
1. 9
2. 10
3. 11
4. 12
Answer: 3

Ques:3. A plano-convex lens (f = 20 cm) is silvered at plane surface. Now focal length will be :
1. 20 cm
2. 40 cm
3. 30 cm
4. 10 cm
Answer: 4

Ques:4. The magnetic flux through a loop of resistance 10 Ω is given by φ = 5t2 – 4t + 1 Weber. How much current is induced in the loop after 0.2 sec ?
1. 0.4 A
2. 0.2 A
3. 0.04 A
4. 0.02 A
Answer: 2

Ques:5. The decimal equivalent of the binary number (11010.101)2 is
1. 9.625
2. 25.265
3. 26.625
4. 26.265
Answer: 3

Ques:6. If momentum is increased by 20%, then kinetic energy increases by
1. 48%
2. 44%
3. 40%
4. 36%
Answer: 2

Ques:7. The area enclosed by y = 3x – 5, y = 0, x = 3 and x = 5 is
1. 12 sq. units
2. 13 sq. units
3. 13 ½ sq. units
4. 14 sq. units
Answer: 4

Ques:8. G.. M. and H. M. of two numbers are 10 and 8 respectively. The numbers are :
1. 5, 20
2. 4, 25
3. 2, 50
4. 1, 100
Answer: 1

Ques:9. The number of permutations by taking all letters and keeping the vowels of the word COMBINE in the odd places is
1. 96
2. 144
3. 512
4. 576
Answer: 4

Ques:10. Let R be the set of real numbers and the mapping f : R → R and g : R → R be defined by f(x) = 5 – x2 and g(x) = 3x – 4 , then the value of (fog)(–1) is
1. –44
2. –54
3. –32
4. –64
Answer: 1
Ques:11. Surface temperature of the sun is of the order of
1. 5000 K
2. 7000 K
3. 6000 K
4. 12000 K
Answer: 1

Ques:12 If charge remains constant, what will happen to the surface potential of a wire whose diameter is doubled but length remains same?
1. Double
2. Half
3. One-third
4. Same
Answer: 4

Ques:13. The momentum of the body having kinetic energy E is doubled. The new Kinetic energy is
1. E
2. 4E
3. 16E
4. 32E
Answer: 2

Ques:14. The friction experienced by a body, when in motion, is known as
1. rolling friction
2. dynamic friction
3. limiting friction
4. static friction
Answer: 2

Ques:15. A smooth cylinder lying on its convex surface remains in __________ equilibrium.
1. stable
2. unstable
3. neutral
Answer: 2

Ques:16. The flow through a nozzle is regarded as
1. constant volume flow
2. constant pressure flow
3. isothermal flow
4. isentropic flow
Answer: 4

Ques:17. The ratio of total useful heat drop to the total isentropic heat drop, is called
1. stage efficiency
2. internal efficiency
3. Rankine efficiency
4. none of these
Answer: 2

Ques:18. The pressure at which the steam leaves the nozzle is known as back pressure.
1. Correct
2. Incorrect
Answer: 1

Ques:19. f a designer is developing a plan for a project in which the entire part is made out of ¾” thick plywood and he only wants to use one view, he should use the ________ view.
1. front
2. top
3. right
4. back
Answer: 1

Ques:20. Center lines are used to locate or represent the centers of ________.
1. arcs
2. circles
3. hidden round features
4. all of the above
Answer: 4