WBJEE  Physics (Category  2) Model Test
Start
Congratulations  you have completed WBJEE  Physics (Category  2) Model Test.
You scored %%SCORE%% out of %%TOTAL%%.
Your performance has been rated as %%RATING%%
Your answers are highlighted below.
Question 1 
A car P moves with a velocity V towards a stationary observer M. Another car Q moves away from M in the same direction with same velocity V. Both the cars continuously blow whistles of same frequency 380 Hz and the observer M hears 20 beats /sec. Assume the velocity of sound is 340 m/sec. The value of V in m/sec is
A  11.3 
B  17.0 
C  20.9 
D  8.5 
Question 2 
A body cools from 50° C to 49.9° C in 5 sec. How long will it take to cool from 40° C to 39.9° C? (The temperature of the surroundings is 30° C)
A  20 sec

B  15 sec 
C  10 sec 
D  5 sec 
Question 3 
In a Carnot heat engine, 8000 J of heat is absorbed from a source of 400° K and 6000 J of heat is rejected to sink. The temperature of the sink is
A  100° K

B  300° K 
C  0° K 
D  273° K 
Question 4 
A spherical black body of radius 12cm radiates 450W power at 500° K. If the radius is halved and temperature doubled, the power radiated in watts would be
A  225

B  450 
C  900 
D  1800 
Question 5 
The same weight of mg is hung from two wires of length l, radius r, and length 2l, radius 2r respectively, having the same Young’s modulus Y. Then, the net elongation equals
A  (2mgl) / (3πr^{2}Y) 
B  (mgl) / (3πr^{2}Y) 
C  (mgl) / (2πr^{2}Y) 
D  (3mgl) / (2πr^{2}Y) 
Question 6 
A solid homogeneous cube floats at the interface of two liquids, mercury and water, kept in a container such that the lower portion of the cube is immersed in mercury and the upper portion is in water. The density of the material of the cube is 7.3 gm/cc and those of mercury and water are respectively 13.6 gm/cc and 1.0 gm/cc. Then the % of volume of the cube immersed in mercury is
A  70% 
B  68% 
C  50% 
D  73% 
Question 7 
An oil drop of radius 10^{6} m carries charge equal to that of 3 electrons. If density of oil is 2 x 10^{3} kg / m^{3}, the electric field required to keep the drop stationary is
A  1.71 x 10^{5} V / m

B  1.71 x 10^{3} V / m 
C  1.71 x 10^{6} V / m 
D  1.71 V / m 
Question 8 
If I is the moment of inertia and E is the kinetic energy of rotation of a body, its angular momentum will be
A  √EI 
B  2EI 
C  E / I 
D  √2EI 
Question 9 
A proton is at rest and is free to move . Another proton moving with a velocity V_{0} strikes the proton at rest. Denote proton mass and charge as m and e respectively and assume a headon collision. Then the closest distance the incident proton approaches towards the other proton is
A  e^{2} / (4πε_{0}mV_{0}^{2}) 
B  e^{2} / (2πε_{0}mV_{0}^{2}) 
C  e^{2} / (πε_{0}mV_{0}^{2}) 
D  2e^{2} / (4πε_{0}mV_{0}^{2}) 
Question 10 
The dimension of a quantity is given by ML^{2}T^{2} I^{2}, where M is mass, L is length, T is time, and I is electric current. Which of the following quantities has this dimension?
A  Capacitor 
B  Inductance 
C  Magnetic Flux 
D  Electric Flux 
Once you are finished, click the button below. Any items you have not completed will be marked incorrect.
Get Results
There are 10 questions to complete.
← 
List 
→ 
Return
Shaded items are complete.
1  2  3  4  5 
6  7  8  9  10 
End 
Return
You have completed
questions
question
Your score is
Correct
Wrong
PartialCredit
You have not finished your quiz. If you leave this page, your progress will be lost.
Correct Answer
You Selected
Not Attempted
Final Score on Quiz
Attempted Questions Correct
Attempted Questions Wrong
Questions Not Attempted
Total Questions on Quiz
Question Details
Results
Date
Score
Hint
Time allowed
minutes
seconds
Time used
Answer Choice(s) Selected
Question Text
All done
Need more practice!
Keep trying!
Not bad!
Good work!
Perfect!