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2022

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8. When strain is produced in a body within elastic limit, its internal energy

(a)  Remains constant                        (b)   Decreases (c)   Increases                           ...

11. Assertion : The Crystal structure gets stabilized even though the sum of elecron gain enthalpy and ionization enthalpy is positive . Reason : Energy is absorbed during the formation of crystal lattice.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If...

7. If the tension on a wire is removed at once, then

(a)  It will break (b)   Its temperature will reduce (c)   There will be no change in its temperature (d)   Its...

6. If the force constant of a wire is K, the work done in increasing the length of the wire by l is

(a)  Kl/2                                     (b) ...

5. A 5 metre long wire is fixed to the ceiling. A weight of 10 kg is hung at the lower end and is 1 metre above the floor. The wire was elongated by 1 mm. The energy stored in the wire due to stretching is

(a)  Zero                                                 (b)   0.05 joule (c)  100 joule                         ...

10. Assertion : Graphite is an example of tetragonal crystal system. Reason : For a tetragonal system.

a = b ≠c, α   =  β = 90 °, ϒ = 120 ° a. If both assertion and...

4. Two wires of same diameter of the same material having the length l and 2l. If the force F is applied on each, the ratio of the work done in the two wires will be

(a)   1 : 2                                 ...

3. Calculate the work done, if a wire is loaded by ‘Mg’ weight and the increase in length is ‘l’

(a)  Mgl                                     ...

9. Assertion : No compound has both schottky and Frenkel defects. Reason : Both defects change the density of the solid.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If...

2. The work done in stretching an elastic wire per unit volume is or strain energy in a stretched string is

(a)  Stress × Strain                             (b)   (1/2)(Stress× Strain) (c)  2× Stress × Strain                 ...

8. Assertion : Lead zirconate is a piezoelectric crystal. Reason : Lead zirconate crystals have no dipole moment.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If...

1. If the potential energy of a spring is V on stretching it by 2 cm, then its potential energy when it is stretched by 10 cm will be

(a)  V/25                                                (b)   5V (c)   V/5                             ...

7. Assertion : On heating ferromagnetic or ferrimagnetic substances, they become paramagnetic. Reason : The electrons change their spin on heating.

a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If...

3. Assertion : Crystalline solids have short range order. Reason : Amorphous solids have long range order

a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If...

2. Assertion : In crystal lattice the size of the cation is larger in a tetrahedral hole than in an octahdral hole. Reason : The cations occupy more space than anions in crystal packing.

  a. If both assertion and reason are true and the reason is the correct explanation of the assertion b....

1. Assertion : Diamond is a precious stone. Reason : Carbon atoms are tetrahedrally arranged in diamond

a. If both assertion and reason are true and the reason is the correct explanation of the assertion b. If...

37. The statement that is INCORRECT about the interstitial compounds is

a. They are chemically reactive b. They have metallic conductive c. They are very hard d. They have high melting...

36. The one that is extensively used as a piezoelectric material is :

a. Tridymite b. Amorphous silica c. Quartz d. Mica Ans. c Explanation : piezoelectric material are those that produce an...

34. Which type of ‘defect’ has the presence of cations in the interstitial sites

a. Frenkel defect b. Metal deficiency defect c. Schottky defect d. Vacancy defect Ans. a Explanation : frenkel defect (13)

33. Schottky defect in a crystal arises due to

a. Creation of equal number of cation and anion vacancies b. Creation of unequal number of cation and anion vacancies...

56. A solid sphere rolls down an inclined plane and its velocity at the

A solid sphere rolls down an inclined plane and its velocity at the bottom is v1. Then same sphere slides...

32. Experimentally it was found that a metal oxide has formula

M0.98  O. Metal M, present as M and M+2  in its oxide. Fraction of the metal which exists as M...

31. The defect that is more likely to occur in almost all types of ionic crystals is

a. Non- stoichiometric defects b. Shottky defects c. Frenkel defects d. all the above Ans. b (32)

55. A solid sphere of mass 0.1kg and radius 2cm rolls down an inclined plane 1.4m in length (slope 1 in 10). Starting from rest its final velocity will be

(a)  1.4 m/sec (b) 0.14 m/sec (c)  14 m/sec (d)  0.7 m/sec Ans .a (27)

54. A solid sphere and a disc of same mass and radius starts rolling down a rough inclined plane, from the same height the ratio of the time taken in the two cases is

(a)      15 : 14 (b)    √15:√14 (c)     14 : 15 (d)    √14:√15 Ans. d (8)

If NaCl si dopd with

10-4  mol % of SrCl2  the concentration of cation vacancies will be a. 6.02 x 1015 mol -1 b. 6.02 x...

53. A thin uniform circular ring is rolling down an inclined plane of in

A thin uniform circular ring is rolling down an inclined plane of inclination 30° without slipping. Its linear acceleration along...

52. A ring solid sphere and a disc are rolling down from the top of the same height, then the sequence to reach on surface is

(a)           Ring, disc, sphere (b)          Sphere, disc, ring (c)           Disc, ring, sphere (d)          Sphere, ring, disc Ans. b (20)

51. A sphere rolls down on an inclined plane of inclination θ. What is the acceleration as the sphere reaches bottom

(a)  5/7 g sin θ (b)  3/5  g sin θ (c) 2/7    g sin θ (d) 2/5 g sin...

50. A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length L and height h. What is the speed of its centre of mass when the cylinder reaches its bottom

(a) √(3/4) gh (b) √(4/3)gh (c)  √4gh (d) √2gh Ans. b (20)

43. A body of moment of inertia

A body of moment of inertia of 3 kg-m2 rotating with an angular velocity of 2 rad/sec has the same...

With which one of the following elements silicon should be doped so as to give p type of semicondutor

a. Selenium b. Boron c. Germanium d. Arsenic Ans. b Explanation   : Boron can easily form positive ion. When silicon...

14. The upper end of a wire of radius 4 mm and length 100 cm is clamped and its other end is twisted through an angle of 30°. Then angle of shear is

(a)   12°                                     ...

42. An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver

(a)  350 N-m (b)  440 N-m (c)   531 N-m (d)  628 N-m Ans. c (20)

13. The lower surface of a cube is fixed. On its upper surface, force is applied at an angle of 30° from its surface. The change will be of the type

(a)   Shape                                              (b)   Size (c)   None                           ...

Some of the polar crystal when heated produce electric current. This phenomena is termed as

a. Ferroelectric effect b. Pyrelectric effect c. Antiferroelectric effect d. piezoelectric effect Ans. b Explanation : pyroelectircity : It is...

12. The reason for the change in shape of a regular body is

(a)  Volume stress                               (b)   Shearing strain (c)   Longitudinal strain                   (d)   Metallic strain...

41. A ring of radius 0.5 m and mass 10 kg is rotating about its diameter with an angular velocity of 20 rad/s. Its kinetic energy is

(a)  10 J (b)  100 J (c)   500 J (d)  250 J Ans. d (80)

39. A solid cylinder of mass 2 kg and radius 0.2m is rotating about its own axis without friction with angular velocity 3 rad/s . A particle of mass 0.5 kg and moving with a velocity 5 m/s strikes the cylinder and sticks to it as shown in figure. The angular momentum of the cylinder before collision will be

(a)  0.12 J–s (b)  12 J–s (c)   1.2 J-s (d)  1.12 J-s Ans. a (22)

Which of the following is true about the charge acquired by p-type semiconductors.

a. Positive b. Neutral c. Negative d. Depends on concentration of p impurity Ans. b (5)

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