Brand new Course Package released! Get 99% off your first purchase with code “99”. Find out more!
Back
0

Shopping cart

Close

No products in the cart.

Shilpa

HomeAuthor: ShilpaPage 25

23. A bullet of mass 0.1 kg is fired with a speed of 100 m/sec, the mass of gun is 50 kg. The velocity of recoil is

(a)  0.2 m/sec                          (b)  0.1 m/sec (c)   0.5 m/sec                          (d)  0.05 m/sec Ans. a (13)

A bullet is fired from a gun. The force on the bullet is given by f =  600- 2 x 10 5 t where F is in newtons and t in seconds. The force on the bullet becomes zero as soon as it leaves the barrel. What is the average impulse imparted to the bullet

(a)  9 Ns                                    (b)  Zero (c)   0.9 Ns                                 (d)  1.8 Ns ans. c (26)

21. A body of mass 0.25 kg is projected with muzzle velocity 100ms ^-1 from a tank of mass 100 kg. What is the recoil velocity of the tank

(a)  5 ms -1                               (b) 25ms -1...

A set of n identical cubical blocks lies at rest parallel to each other along a line on a smooth horizontal surface. The separation between the near surfaces of any two adjacent blocks is L. The block at one end is given a speed v towards the next one at time t=0 . All collisions are completely inelastic, then

(a)      The last block starts moving at  t=(n-1)L/v (b)  The last block starts moving at  t=n(n-1)L/2v (c)   The centre of...

A particle P moving with speed v undergoes a head -on elastic collision with another particle Q of identical mass but at rest. After the collision

(a)  Both P and Q move forward with speed  v/2 (b)  Both P and Q move forward with speed  v/√2...

A body of mass m moving with velocity v collides head on with another body of mass 2m which is initially at rest. The ratio of K.E. of colliding body before and after collision will be

(a)  1 : 1                                    (b)  2 : 1 (c)   4 : 1                                    (d)  9 : 1 Answer: d (8)

Consider elastic collision of a particle of mass m moving with a velocity u with another particle of the same mass at rest. After the collision the projectile and the struck particle move in directions making angles  θ1 and  θ2 respectively with the initial direction of motion. The sum of the angles  θ1+θ2, is

(a)  45°                                     (b)  90° (c)  135°                                   (d)  180° Answer:b (9)

Two particles of masses  m1  and  m2  in projectile motion have velocities

(a)  Zero                          (b) (m1+m2)gt0 (c) 2(m1+m2)gt0     ...

15. A vessel at rest explodes into three pieces. Two pieces having equal masses fly off perpendicular to one another with the same velocity 30 meter per second. The third piece has three times mass of each of other piece. The magnitude and direction of the velocity of the third piece will be

(a)   10√2 m/second  and 135° from either (b)   10√2 m/second  and 45° from either (c)   10/√2 m/second  and 135° from...

A shell is fired from a cannon with velocity v m/sec at an angle θ with the horizontal direction. At the highest point in its path it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon and the speed in m/sec of the other piece immediately after the explosion is

(a)     3v cosθ                         (b) 2v  cosθ (c)   ...

A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to

(a)     t1/2                               (b)  t3/4 (c) ...

Consider the following two statements 1. Linear momentum of a system of particles is zero 2. Kinetic energy of a system of particles is zero Then

(a)  1 implies 2 and 2 implies 1 (b)  1 does not imply 2 and 2 does not imply 1...

An open knife edge of mass ‘m’ is dropped from a height ‘h’ on a wooden floor. If the blade penetrates upto the depth ‘d’ into the wood, the average resistance offered by the wood to the knife edge is

(a)  mg                  (b)  mg (1-h/d) (c)   mg  (1+h/d)         ...

The kinetic energy acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to

(a)  √m                                  (b)  Independent...

A particle free to move along the x-axis has potential energy given by U(x) = K [1-exp(-x)2] for – ∞<–x<–+∞, where k is a positive constant of appropriate dimensions. Then 

(a)  At point away from the origin, the particle is in unstable equilibrium (b)  For any finite non-zero value of...

A ball hits the floor and rebounds after inelastic collision. In this case

(a)  The momentum of the ball just after the collision is the same as that just before the collision (b) ...

A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is 

(a)  MgL                                    (b)  MgL/3 (c)   MgL/9                                (d)  MgL/18 Answer: D (7)

If   W1, W2 ,and W3 represent the work done in moving a particle from A to B along three different paths 1, 2 and 3 respectively (as shown) in the gravitational field of a point mass m, find the correct relation between W1, W2 and W

(a)       W1>W2>W3 (b)   W1=W2=W3 (c)  W1<W2<W3 (d)  W2 >W1>W3 Answer: b   (14)

A particle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to -K/r2 , where K is a constant. The total energy of the particle is

a)    K/2r                        (b)  – (K/2r) (c)     ...

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)

The displacement x of a particle moving in one dimension under the action of a constant force is related to the time t by the equation t=√x+3 , where x is in meters and t is in seconds. The work done by the force in the first 6 seconds is

(a)  9 J                                       (b)  6 J (c)   0 J                                       (d)  3 J Answer: C (6)

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)

A force F = -K(yi+xj) (where K is a positive constant) acts on a particle moving in the xy-plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a, 0) and then parallel to the y-axis to the point (a, a). The total work done by the force F on the particles is

(a)     -2 Ka2                           (b)  2 Ka2 (c) ...

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)

A lorry and a car moving with the same K.E. are brought to rest by applying the same retarding force, then

(a)  Lorry will come to rest in a shorter distance (b)  Car will come to rest in a shorter distance...

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)

1. A jet plane flies in the air because

    (a)    The gravity does not act on bodies moving with high speeds (b)   The thrust of the...

If g is the acceleration due to gravity on the earth’s surface, the gain in the potential energy of an object of mass m  raised from the surface of earth to a height equal to the radius of the earth R, is

(a)      1/2 mgR                         (b)  2 mgR (c) ...

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

(19)

6. The researches on photosynthesis started

(a)      In the 17th century                  (b)  In the 18th century (c)   In the 19th century          (d)  In the early 20th...

58. Absorption of water by gram is the process of

(a)  Diffusion                            (b)  Imbibition (c)   Endosmosis                       (d)  Exosmosis (e)  All of the above Ans.(b)      In gram and wheat the volume...

57. In the process of osmosis

(a)  Both protoplasm and cell wall act as a single layer (b)  Only protoplast acts as a single layer (c)  ...

56. In seed germination, the first phenomenon takes place is

(a) Diffusion (b) Osmosis (c) Imbibition (d) All the above Ans. (c)   Imbibition takes place by outermost layer of seed....

60. Osmosis involves

(a)  Cell to cell movement of water (b)  Movement of water through cortical cells (c)   Active absorption of water through...

59. Osmosis is the property of

(a)  Solutes (b)  Solutions (c)   Semipermeable membrane (d)  Solvent Ans. (c)      It is essential for operation of osmosis. In plant–water...

8. ‘Photosynthesis is the conversion of light energy within a plant’ was first stated by

(a)      Willstatter and Stoll           (b)  Mayor and Anderson (c)   Benson and Calvin         ...

7. Most of the plants contain a green colouring pigment which is responsible for photosynthesis. This pigment was named chlorophyll by

(a)      Melvin Calvin                            (b)  Jean Senebie (c)   Julius Robert Mayer         (d)  Pelletier Caventou Answer:  (d)  Pelletier Caventou Explanation:    (d)         ...

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...

Popular posts

Haryana Police Recruitment Group C & D Vacancies & Coaching | Haryana CET Based Preparation
NEET 2026 FAQ – Syllabus, Exam Date, Preparation Tips & Course (Flame Institute)
SSC GD 2026, Notification, Apply Online, Vacancy, Eligibility, Exam Date, Syllabus, Online Form, Age Limit, PET/PST, Selection Process

Sign up to receive latest updates

Get in touch

Call us directly?

9888949978

Address

Flame Institute SCF 18 Near Chawla Lights Phase 7 Mohali

Email

FlameInstitute@gmail.com
Need some help?
Popular subjects
Need some help?

Youtube

2,3M Subribe

Facebook

2,3M Subribe

Instagram

2,3M Subribe

Twitter

2,3M Subribe
  • © 2025 Flame Institute.All rights reserved.
English
USD
error: Content is protected !!
Courses
Search

Search

    ArticlesCart