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WBJEE Entrance Exam Guess Paper

Ques:1. In which following triploblastic animal coelom is absent ?
Platyhelminthes
Aschelminthes
Annelids
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
9
10
11
12
Answer: 3

Ques:3. A plano-convex lens (f = 20 cm) is silvered at plane surface. Now focal length will be :
20 cm
40 cm
30 cm
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 ?
0.4 A
0.2 A
0.04 A
0.02 A
Answer: 2

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

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

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

Ques:8. G.. M. and H. M. of two numbers are 10 and 8 respectively. The numbers are :
5, 20
4, 25
2, 50
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
96
144
512
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
–44
–54
–32
–64
Answer: 1

Ques:11. Surface temperature of the sun is of the order of
5000 K
7000 K
6000 K
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?
Double
Half
One-third
Same
Answer: 4

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

Ques:14. The friction experienced by a body, when in motion, is known as
Rolling friction
Dynamic friction
Limiting friction
Static friction
Answer: 2

Ques:15. A smooth cylinder lying on its convex surface remains in __________ equilibrium.
Stable
Unstable
Neutral
Answer: 2

Ques:16. The flow through a nozzle is regarded as
Constant volume flow
Constant pressure flow
Isothermal flow
Isentropic flow
Answer: 4

Ques:17. The ratio of total useful heat drop to the total isentropic heat drop, is called
Stage efficiency
Internal efficiency
Rankine efficiency
None of these
Answer: 2

Ques:18. The pressure at which the steam leaves the nozzle is known as back pressure.
Correct
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.
Front
Top
Right
Back
Answer: 1

Ques:20. Center lines are used to locate or represent the centers of ________.
Arcs
Circles
Hidden round features
All of the above
Answer: 4