This document contains an unsolved physics exam from 1990 containing multiple choice and fill-in-the-blank questions testing concepts in mechanics, waves, electricity, and magnetism. The exam is divided into three sections. Section I contains 6 multiple choice questions. Section II contains 4 fill-in-the-blank questions requiring numeric or one-word answers. Section III asks the reader to match 3 physical quantities with their appropriate units from a list of choices. The document provides context for summarizing a past physics exam, but does not include answers to the questions.

1. IIT JEE –Past papersPHYSICS- UNSOLVED PAPER - 1990

2. SECTION – ISingle Correct Answer TypeIn each of the statements given below, four alternatives are given. In some cases, more than one alternative is correct. Select the correct alternative(s) in each case and write down the corresponding letter(s)(a),(b),(c) or (d) in your answer book. For each part marks will be awarded only if all the correct alternatives are selected and written:

3. 01ProblemWhen a bicycle is in motion, for force of friction exerted by the ground on the two wheels is such that it acts. In the backward direction on the front wheel and in the forward direction on the rear wheel.In the Forward direction on the front wheel and in the backward direction on the rear wheel. In the backward direction on both the front and the rear wheels.In the forward direction on both the front and the rear wheels

4. Problem02A particle of mass m is projected with a velocity v making an angle of 450 With the horizontal. The magnitude of the angular momentum of the projectile about the point of projection when the particle is at its maximum height h is Zerob.c.d.

5. Problem03A uniform cylinder of length L and mass M having cross-sectional area A is suspended, with its length vertical, from a fixed point by a mass less spring, such that it is half-submerged in a liquid of density pat equilibrium position. When the cylinder is given a small downward push and released it starts oscillating vertically with a frequency of oscillation of the cylinder isa.b. c. d.

6. Problem04When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas isa.b.c.d.

7. Problem05A thin prism P1with angle 40and made from glass of refractive index 1.54 is combined with another thin prism P2 made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of the prism P2 is 5.33040302.60

8. Problem06A wave is represented by the equation Where x is in meters and t in seconds. The expression represents A wave traveling in the positive x direction with a velocity 1.5 m/s A wave traveling in the negative x direction with a velocity 1.5m/sA wave traveling in the negative x direction having a wavelength 0.2mA wave traveling in the positive x direction having a wavelength 0.2m

9. Problem07Seven capacitor each of capacitance 2 are to be connected in a configuration to obtain an effective capacitance of (10/11) which of the combination (s) shown in fig. 1990.1 will achieve the desired result?

10. SECTION – IIFill in the balksFill in the blanks in the following statement. Indicate the sub-division number and write down your answer corresponding to each blank strictly in the order in which it appear in the statements.

11. 01ProblemA wire ABCDEF (with each side of length L) bent as shown in Fig. 1990.2 and carrying a current I is placed in a uniform magnetic induction B parallel to the positive y –direction. The force experienced by the wire is _________ in the _________ direction.

12. Problem02The amplitude of a wave disturbance propagating in the positive x-axis is given by y = 1/(1 + x2) at time t = 0 and by y =1/[1+(x – 1)2 at t = 2 seconds , where x and y are in meters . The shape of the wave disturbance does not change during the propagation. The velocity of the wave is _________ m/s.

13. Problem03___________ biasing of the p-n junction offers high resistance to current flow across the junction. This biasing is obtained by connecting the p-side to the __________ terminal of the battery.

14. Problem04The wavelength of the characteristic X-ray Ka line emitted by a hydrogen-like element is 0.32 Å . The wavelength of the line emitted by the same element will be ______.

15. SECTION – IIIMach the followingColumn I give three physical quantities. Select the appropriate units for these from the choices given in column II. Some of the physical quantities may be have more than one choice

16. 01ProblemI IICapacitance ohm second Inductance coulomb2 joule-1Magnetic induction coulomb (volt)-1 Newton (ampere meter)-1 Volt second (ampere)-1

17. FOR SOLUTION VISIT WWW.VASISTA.NET