# NEET Physics: Questions 920 - 923 of 2099

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## Question number: 920

» Laws of Motion » Laws of Friction

### Question

A body of mass 800 g slides on a rough horizontal surface. If the frictional force is 6.0 N, the angle made by the contact force on the body with the vertical will be

### Choices

Choice (4) | Response | |
---|---|---|

a. | 27° | |

b. | 63° | |

c. | 53° | |

d. | 37° |

## Question number: 921

» Kinematics » Average Speed and Instantaneous Velocity

### Question

The rate of burning of fuel in a rocket is 60 gm/sec. and comes out with and velocity 5 x 10 ^{3} m/s. The force exerted by gas on rocket will be –

### Choices

Choice (4) | Response | |
---|---|---|

a. | 2.5 x l0 | |

b. | 2.5 x l0 | |

c. | 300 N | |

d. | 200 N |

## Question number: 922

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A 30 g bullet pierces through a plate of mass m _{1} = 1 kg and then comes to rest inside a second plate of mass m _{2} = 1.5 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m1 and m _{2}. (Neglect any loss of material of the bodies, due to action of bullet. ) will be -

### Choices

Choice (4) | Response | |
---|---|---|

a. | 25.67% | |

b. | 46.45% | |

c. | 20.68% | |

d. | 39.525% |

## Question number: 923

» Work, Energy and Power » Kinetic Energy

### Question

Which of the following hold when two particles of masses m _{1} and m _{2} undergo elastic collision?

(1) When m, = m _{2} and m ^{2} is stationary, there is maximum transfer of kinetic energy in head on collision

(2) When *m* _{i}* = va* _{2} and m ^{2} is stationary, there is maximum transfer of momentum in head on collision

(3) When *m* _{l}* > > * m _{2} and m ^{2} is stationary, after head on collision m _{2} moves with twice the velocity of *m* _{1}

(4) When the collision is oblique and *m* _{1}* = * m _{2} with m _{2 } stationary, after the collision the particle move in opposite directions.

Select the correct answers and mark it according to the following codes

### Choices

Choice (4) | Response | |
---|---|---|

a. | 2 and 4 are correct | |

b. | 1 and 2 are correct | |

c. | 1 and 3 are correct | |

d. | 1, 2 and 3 are correct |