# KVPY Stream-SA Physics: Questions 150 - 153 of 242

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to **242** questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 200.00 or

## Question number: 150

» Work, Energy and Power » Power

### Question

A boy of weight 50 kg climbs up a staircase carrying 15 kg load on his head. The staircase has 35 steps and each step has a height of 15 cm. If he takes 20 seconds to climb, calculate the power developed by him. (g = 9.8 ms^{-2})

### Choices

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

a. | 167.21 | |

b. | 323.3 | |

c. | 527.5 | |

d. | 95.32 |

## Question number: 151

» Laws of Motion » Law of Conservation of Linear Momentum

### Question

A massless platform of hard paper is kept on a light elastic spring as figure shows. When a particle of mass 500 g is dropped on the platform from a height of 0.32 m, the particle strikes the platform and compresses the spring by 0.05 m. From what height the particle is dropped to get a compression of 0.08 m?

### Choices

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

a. | 0.78 | |

b. | 0.68 | |

c. | 0.86 | |

d. | 0.70 |

## Question number: 152

» Current Electricity » Electrical Energy and Power

### Question

In the following circuit, the 3 Ω resistor dissipates power P_{i}. If the resistor is replaced by 7 Ω, the power dissipated in it is P_{f}, then

### Choices

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

a. |
| |

b. |
| |

c. |
| |

d. | Question does not provide sufficient data or is vague |

## Question number: 153

» Current Electricity » Kirchhoff's Laws

### Question

Figure below shows a portion of an electric circuit with the currents in amperes and their directions. The magnitude and direction of the current in the portion AB is

### Choices

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

a. | 1 A from A to B | |

b. | 2A from B to A | |

c. | 3 A from B to A | |

d. | 0A |