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ResourcesEducationalQuestion Papers

WB-JEE Sample Paper

Posted Date: 26-May-2010 Category: Question Papers Rating:

Author: Ritesh Gedam Member Level: Gold Points: 10 (R 4)

WB-JEE Sample Question Paper

WB-JEE Sample Paper

1. One Kg of copper is drawn into a w ire of 1mm diameter and a w ire of 2 mm diameter. The resistance of the

two w ires will be in the

ratio

(A) 2 : 1 (B) 1 : 2 (C) 16 : 1 (D) 4 : 1

Ans : (C)

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?

(A) 65% (B) 75% (C) 85% (D) 95%

Ans : (D)

3. A wire of resistance 5 is draw n out so that its new length is 3 times its original length.What is the

reistance of the new wire?

(A) 45 (B) 15 (C) 5/3 (D) 5

Ans : (A)

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

(A) R = r/2 (B) R = r (C) R = r/3 (D) R = 2r

Ans : (A)

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

(A) 5 (B) 6 (C) 7 (D) 4

Ans : (B)

6. 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

(A) = 5/3R (B) = 4/3 R (C) = R/4 (D) = 3R/4

Ans : (B)

7. An alternating current of rms value 10 A is passed through a 12 resistor. The maximum potential

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difference across the resistor

is

(A) 20 V (B) 90 V (C) 1969.68 V (D) none

Ans : (C)

8. The poisson's ratio of a material is 0.5. If a force is applied to a w ire of this material, there is a decrease in

the cross-sectional area

by 4%. The percentage increase in the length is :

(A) 1 % (B) 2% (C) 2.5% (D) 4%

Ans : (D)

9. 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

(A) 3.43 (B) 3.5 (C) 3.4 (D) 3.34

Ans : (A)

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

(A) low boiling point and high pressure

(B) high boiling point and low pressure

(C) low bo iling point and low pressure

(D) high boiling point and high pressure

Ans : (C)

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