Home
Class 12
PHYSICS
STATEMENT-1: It is easier to pull a heav...

STATEMENT-1: It is easier to pull a heavy object than to push it on a level ground and
STATEMENT-2: The magnitude fo frictional force depends on the nature of the two surfaces in contact.

A

If both Statement 1 & Statement 2 are True & the Reason is a correct explanation of the Assertion.

B

If both statement 1 & statement 2 are True but Reason is not a correct explanation of the Assertiion.

C

If statement 1 is True but the statement 2is False.

D

If both statement 1 & statement 2 are False

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

Which one of the force does not depend on the velocity - frictional force between contact surface of two solid or viscous force ?

STATEMENT-1 A convex lens may be diverging STATEMENT -2 The nature of a lens depends upon the refractive incides fo the material of lens and surrounding medium besides geometry.

Statement-1: It is better to wash the clothes in cold soap solution. Statement-2: The surface tension of cold solution is more than the surface tension of hot solution:

Two blocks A and B of mass 2 kg and 4 kg respectively are placed on a smooth inclined plane and 2 kg block is pushed by a force F acting parallel to the plane as shown. If N be the magnitude of contact force applied on B by A, which of the following is/are correct?

STATEMENT-1: Two balls are dropped one after the other form a tall tower. The distance between them increases linearly with time (elapsed after the second ball is dropped and before the first hits ground). STATEMENT-2: Relative acceleration is zero, whereas relative velocity non-zero in the above situation.

Of the following statements , which are true for S_(N)2 reaction. (a) Tertiar alkyl halides reacts faster than secondary. (b) The absolute configuration of product is opposite to that of the reactant when an optically active substrate is used. (c) The used shows first order kinetics. (d) The rate of the reaction depends markedly on the nucleophilicity of the attacking reagent. (e) The mechanism is one step. (f) Carbocations are intermediate. (g) Rate prop [Alkyl][halides] (h) The rate of the reaction depends on the nature of the leaving group.

Thin films, including soap bubbles and oil slicks, show patterns of alternating dark and bright regions resulting from interference among the reflected light waves. If two waves are in phase their crest and troughs will coincide. The interference will be constructive and the aplitude of the resultant wave will be greater than the amplitude of either constituent wave. if the two waves are out of phase, the crests of one wave will coincide with the troughs of the other wave. The interference will be destructive and the amplitude of the resultant wave will be less than that of either constituent wave. at the interface between two transparent media some light is reflected and some light is refracted. * When incident light, reaches the surface at point a, some of the light is reflected as ray R_(a) and and some is refracted following the path ab to the back of the film. *At point b some of the light is refracted out of the film and part is reflected back refracted out of the fiml as ray R_(c) . R_(a) and R_(c) are parallel. However, R_(c) has travelled the extra distance within the film of abc. if the angle of incidence is small then abc is approximately twice the film's thickness. if R_(a) and R_(c) are in phase they will undergo constructive interference and the region ac will be bright if R_(a) and R_(c) are out of phase, they will undergo destructive interference. * Refraction at an interface never changes the phase of the wave. * For reflection at the interface between two media 1 and 2, if n_(1)ltn_(2) the reflected wave will change phase by pi . if n_(1)gtn_(2) the reflected wave will not undergo a phase change. for reference n_(air)=1.00 * if the waves are in phase after refection at all interfaces, then the effects of path length in the film are Constructive interference occur when (n= refractive index) 2t=mlamda//n" "m=0,1,2,3... .. Destructive interference occurs when 2t=(m+1//2)lamda//n" "m=0,1,2,3... Q. A 600 nm light is perpendicularly incident on a soap film suspended in air. The film is 1.00 mum thick with n=1.35. Which statement most accurately describes the interference of the light reflected by the two surfaces of the film?

Assertion: Pulling a lawn roller is easier than pushing it. Reason:Pushing increases the apparent weight and hence the force of friction.

This question contains Statement -1 and Stantement -2 Of the four choices given after the statements, choose the one that best desctibes the two statemesnts. Statement -1: For a mass M kept at the center of a cube of side 'a', the flux of gravitational field passing through its sides 4piGM. Statement -2: If the direction of a field due to a point source is radial and its dependence on the distance 'r' from the source is given as (1)/(r^2) , its flux throught a closed surface depends only on the strength of the source enclosed by the surfcae and not on the size or shape of the surface.

Statement-1: In gravity free space, the liqid in a capillary tube will rise to infinite height. Statement-2: In the absence of gravity there will be no force to prevent the rise of liquid due to surface tension.

ALLEN -TEST PAPER-Exercise (Physics)
  1. Assertion :- Work done by frictional force may be sometimes path indep...

    Text Solution

    |

  2. Assertion :- Work done is positive when force acts in the direction of...

    Text Solution

    |

  3. STATEMENT-1: It is easier to pull a heavy object than to push it on a ...

    Text Solution

    |

  4. Assertion :- When a man climbs the rope friction force acts in downwar...

    Text Solution

    |

  5. Assertion :- According work energy theorem net work done on a body is ...

    Text Solution

    |

  6. Assertion :- Mass and energy are not conserved separately,but are cons...

    Text Solution

    |

  7. Assertion :- When a spring is elongated work done by spring is negativ...

    Text Solution

    |

  8. A particle is moving on a circular path such that at any instant its p...

    Text Solution

    |

  9. A car is moving along a circular track with tangential acceleration of...

    Text Solution

    |

  10. A point mass moves along a circle of radius R with a constant angular ...

    Text Solution

    |

  11. A car is moving on circular path of radius 100m such that its speed is...

    Text Solution

    |

  12. A bob of mass m is attached at one end of a string of length l other e...

    Text Solution

    |

  13. A ball of mass m inside a smooth spherical shell of radius R with velo...

    Text Solution

    |

  14. A bead is arranged to move with constant speed around a loop that lies...

    Text Solution

    |

  15. A particle is suspended from a string of length R. It is given a veloc...

    Text Solution

    |

  16. The angular displacement (theta) of the blades of a ceiling fan, when ...

    Text Solution

    |

  17. A wheel of radius R=0.1m is rolling without slipping on a horizontal s...

    Text Solution

    |

  18. Two identical rings each of mass m with their planes mutually perpendi...

    Text Solution

    |

  19. The moment of inertia of a uniform flat disc about its own axis is I. ...

    Text Solution

    |

  20. The diagram shows a uniform disc of mass M & radius 'a', if the moment...

    Text Solution

    |