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Question Bank

HomeFlame InstituteQuestion BankPage 2
24.To double the length of a iron wire having  area of cross-section 0.5 cm2, the required force will be  (Y=1012 dyne/cm2)...

Buna -S rubber is which of the following of 1-3 butadiene and styrene

a.  Polymers b. Copolymer c. Addition d. Condensation polymer Ans. b (31)

23. If the length of a wire is reduced to half, then it can hold the ……… load

(a)      Half                                     ...

22. A and B are two wires. The radius of A is twice that of B. They are stretched by the some load. Then the stress on B is

(a)      Equal to that on A                     (b)  Four times that on A (c)   Two times that on A     ...

104. A symmetrical body of mass M and radius R is rolling without slipping on a horizontal surface with linear speed v. Then its angular speed is

(a)   v/R (b)  Continuously increasing (c)   Dependent on mass (d)  Independent of radius (R) Ans. a (77)

100. A solid sphere is moving on a horizontal plane. Ratio of its transitional Kinetic energy and rotational energy is

(a)    1/5 (b)   5/2 (c)   3/5 (d)   5/7 Ans. b (7)

Acceleration due to gravity ‘g’ for a body of mass ‘m’ on earth’s surface is proportional to (Radius of earth=R, mass of earth=M)

(a)        GM/R2                               (b)  m0 (c)   ...

78. An equilateral triangle ABC formed from a uniform wire has two small identical beads initially located at A. The triangle is set rotating about the vertical axis AO. Then the beads are released from rest simultaneously and allowed to slide down, one along AB and the other along AC as shown. Neglecting frictional effects, the quantities that are conserved as the beads slide down, are

      (a)  Angular velocity and total energy (kinetic and potential) (b)  Total angular momentum and total energy (c)  ...

76.

Two rigid bodies A and B rotate with rotational kinetic energies EA and EB respectively. The moments of inertia of...

61. From a uniform wire, two circular loops are made (i) P of radius r and (ii) Q of radius nr. If the moment of inertia of Q about an axis passing through its centre and perpendicular to its plane is 8 times that of P about a similar axis, the value of n is (diameter of the wire is very much smaller than r or nr)

(a)  8 (b)  6 (c)  4 (d)  2 Ans. d (9)

24. Assertion : A body subjected to three concurrent forces cannot be in equilibrium. Reason : If large number of concurrent forces acting on the same point, then the point will be in equilibrium, if sum of all the forces is equal to zero.

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

22. Assertion : A reference frame attached to earth is an inertial frame of reference. Reason : The reference frame which has zero acceleration is called a non inertial frame of reference.

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

A geostationary satellite

(a)      Revolves about the polar axis (b)  Has a time period less than that of the near earth satellite (c)  ...

The pigment phycoerythrin is characteristic of

(a)  Green algae                       (b)  Brown algae (c)           Red algae               (d)          Blue green algae Ans. c (9)

Two identical solid copper spheres of radius R placed in contact with each other. The gravitational attracton between them is proportional to 

(a)      R2                                     ...

Which of the following statements about the gravitational constant is true

(a)      It is a force (b)  It has no unit (c)   It has same value in all systems of units...

54. Moment of inertia of a sphere of mass M and radius R is I. Keeping constant if a graph is plotted between I and R, then its form would be

Ans. d (23)

46. A wheel of mass 10 kg has a moment of inertia of 160 kg–m2 about its own axis, the radius of gyration will be

(a)  10 m (b)  8 m                                                  (c)   6 m (d)  4 m Ans. d (44)

Assertion : A light body and heavy body have same momentum. Then they also have same kinetic energy. Reason : Kinetic energy does not depend on mass of the body.

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

27. When a ceiling fan is switched off, its angular velocity falls to half while it makes 36 rotations. How many more rotations will it make before coming to rest (Assume uniform angular retardation)

(a)       36 (b)     24 (c)     18 (d)     12 Ans. d (19)

23. The planes of two rigid discs are perpendicular to each other. They are rotating about their axes. If their angular velocities are 3 rad/sec and 4 rad/sec respectively, then the resultant angular velocity of the system would be

(a)           1 rad/sec (b)          7 rad/sec (c)           5 rad/sec (d)         √12 rad/sec Ans. c (690)

7. A 100 g iron ball having velocity 10 m/s collides with a wall at an angle 30° and rebounds with the same angle. If the period of contact between the ball and wall is 0.1 second, then the force experienced by the wall is

(a)       10 N                                                 (b)   100 N (c)   1.0 N                                       (d)   0.1 N answer : a (7)

6. If a force of 250 N act on body, the momentum acquired is 125 kg-m/s. What is the period for which force acts on the body

(a)       0.5 sec                                             (b)   0.2 sec (c)   0.4 sec                                    (d)   0.25 sec answer : a (30)

5. A wagon weighing 1000 kg is moving with a velocity 50km/h on smooth horizontal rails. A mass of 250 kg is dropped into it. The velocity with which it moves now is

(a)       2.5 km/hour                                  (b)   20 km/hour (c)   40 km/hour                          (d)   50 km/hour answer : c (6)

4. In which of the following cases forces may not be required to keep the

(a)       Particle going in a circle (b)   Particle going along a straight line (c)   The momentum of the particle constant...

3. A rocket has a mass of 100 kg. 90% of this is fuel. It ejects fuel vapours at the rate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is

(a)       Zero                                                 (b)   500 N (c)   1000 N                                   (d)   2000 N ANSWER  : b (11)

2. A player caught a cricket ball of mass 150 gm moving at a rate of 20 m/s. If the catching process be completed in 0.1 s, then the force of the blow exerted by the ball on the hands of the player is

  (a)       0.3 N                                                (b)   30 N (c)   300 N                                      (d)   3000 N ANSWER :  b (8)

14. The angular speed of a fly–wheel making 120 revolution/minute is

(a)       π rad/sec (b)  2π rad/sec                                     (c)   4 π rad/sec (d)  4π2 rad/sec Ans. c (55)

11. Three identical spheres, each of mass 1 kg are placed touching each other with their centres on a straight line. Their centres are marked K, L and M respectively. The distance of centre of mass of the system from K is

(a)   (KL+KM+LM)/3 (b)  (KL+KM)/3 (C)  (KL+LM)/3 (d)  (KM+LM)/3 Ans. b (36)

in punjabi notes for master cadre

punjabi notes for master cadre https://flameinstitute.com/Discount%20package/master-cadre-coaching-physics-chemistry-biology/ (177)

58. The main difference between the molecules of chlorophyll a and b is

(19)

reasoning in punjabi pdf

(74)

Punjab Police coaching institute

Punjab Police coaching institute FLAME INSTITUTE SCF-18 TOP FLOOR PHASE-7 MOHALI 9888949978 (22)

51. In the course of imbibition, the volume of the system

(a)  Decreases                          (b)  Increases (c)   Unchanged                        (d)  None of these Ans.  (b)  In the course of imbibition the volume of the...

49. If wood is kept under water, then it becomes swell due to activity of

(a)  Protein                               (b)  Cellulose (c)   Both (a) and (b)               (d)  Minerals Ans.      (c)   A dry wooden piece when soaked...

8. Dry seeds when placed in water swells due to

(a)  Imbibition                         (b)  Absorption (c)   Diffusion                            (d)  Adsorption Ans.   (a)  Meterials capable of imbibition such as proteins and cellulose in...

35. Good soil is

(a)  Which holds whole of the water that enters into it (b)  Which allows percolating the water slowly from it...

25. The largest number, which on dividing 25, 73 and 97 leaves equal remainder in each case is

  ਉਹ ਵਡੀ ਤੋਂ ਵਡੀ ਸੰਖਿਆ ਜੋ 25, 73, 97ਨਾਲ ਭਾਗ ਕਰਨ ਤੇ ਹਰ ਵਾਰ ਸਮਾਨ ਬਚਾਉਦੀ ਹੈ। a) 6 ...

24.The least number which is a perfect square and is divisible by each of the number 8, 12, 16, 26, 39 and 52 is

  ਛੋਟੀ ਤੋਂ ਛੋਟੀ ਵਰਗ ਸੰਖਿਆ ਜੋ 8, 12, 16, 26  39 52 ਨੂੰ ਪੂਰਾ ਪੂਰਾ ਵਿਭਾਜਿਤ ਹੋਵੇ। a) 1444...

21.  The L.C.M of three different numbers is 120. Which of the following cannot be their H.C.F?  

तीन अलग-अलग संख्याओं का L.C.M 120 है। निम्नलिखित में से कौन सा उनका H.C.F नहीं हो सकता है? ਤਿੰਨ ਅਲਗ...
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