WBJEE 2014 Solved Physics Question Paper – Part 7

May 12, 2017 18:13 IST

Find WBJEE 2014 Solved Physics Question Paper – Part 7 in this article. This paper consists of 5 questions (#31 to #35) from WBJEE 2014 Physics paper. Detailed solution of these questions has been provided so that students can match their solutions.

Importance of Previous Years’ Paper:

Previous years’ question papers help aspirants in understanding exam pattern, question format, important topics and assessing preparation. It has also been seen that sometimes questions are repeated in WBJEE Exam. So, this paper will certainly boost your confidence.

31. A metal rod is fixed rigidly at two ends so as top event its thermal expansion. If L, α and Y respectively denote the length of the rod, coefficient of linear thermal expansion and Young’s modulus of its material, then for an increase in temperature of the rod by ΔT, the longitudinal stress developed in the rod is

(A) inversely proportional to α

(B) inversely proportional to Y

(C) directly proportional to ΔT/Y

(D) independent of L

Ans: (D)

Sol:

WBJEE 2014

So, stress is independent of L.

32. A uniform rod is suspended horizontally from its mid-point. A piece of metal whose weight is W is suspended at a distance l from the mid-point. Another weight W1 is suspended on the other side at a distance l1 from the mid-point to bring the rod to a horizontal position. When W is completely immersed in water, W1 needs to be kept at a distance l2 from the mid-point to get the rod back into horizontal position. The specific gravity of the metal piece is

WBJEE 2014

Ans: (C)

Sol:

WBJEE 2014

33. A particle is moving uniformly in a circular path of radius r. When it moves through an angular displacement θ, then the magnitude of the corresponding linear displacement will be

WBJEE 2014

Ans: (D)

Sol:

WBJEE 2014

34. A luminous object is separated from a screen by distance d. A convex lens is placed between the object and the screen such that it forms a distinct image on the screen. The maximum possible focal length of this convex lens is

(A) 4d

(B) 2d

(C) d/2

(D) d/4

Ans: (D)

Sol:

From the lens displacement method we can deduce that, the maximum possible focal length of the convex lens is d/4.

35. The intensity of magnetization of a bar magnet is 5 0 × 104 Am–1. The magnetic length and the area of cross section of the magnet are 12 cm and 1 cm2 respectively. The magnitude of magnetic moment of this bar magnet is (in SI unit)

(A) 0.6

(B) 1.3

(C) 1.24

(D) 2.4

Ans: (A)

Sol:

WBJEE 2014

So, the magnitude of magnetic moment of this bar magnet is 0.6

Also Get:

WBJEE Sample Papers

WBJEE Previous Years' Question Papers

WBJEE Online Test

Show Full Article

Post Comment

Register to get FREE updates

All Fields Mandatory
  • Please Select Your Interest
  • By clicking on Submit button, you agree to our terms of use
  • A verifcation code has been sent to
    your mobile number

    Please enter the verification code below

X

Register to view Complete PDF

Newsletter Signup

Copyright 2017 Jagran Prakashan Limited.