# NEET Physics: Questions 1169 - 1173 of 2099

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## Question number: 1169

» Dual Nature of Matter and Radiation » De-Broglie Relation

### Question

A photon and an electron have equal energy E. is proportional to

### Choices

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

a. |
| |

b. |
| |

c. |
| |

d. | Not depend upon E |

## Question number: 1170

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

### Question

The latent heat of vaporization of water is 2240 J/gm. If the work done in the process of expansion of 1 *g * of water is 168 J, then increase in internal energy is

### Choices

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

a. | 1904 J | |

b. | 2072 J | |

c. | 2240 J | |

d. | 2408 J |

## Question number: 1171

» Properties of Solids & Liquids » Thermal Expansion

### Question

2 kg of ice at - 20°C is mixed with 5 kg of water at 20°C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg/°C and 0.5 kcal/kg/°C while the latent heat of fusion of ice is 80 kcal/kg

### Choices

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

a. | 4 kg | |

b. | 7 kg | |

c. | 2kg | |

d. | 6 kg |

## Question number: 1172

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

### Question

The separation between Bragg’s planes in a crystal is 10 Å. Then the wavelength of those X-rays which can be diffracted by this crystal is-

(1) 5 Å (2) 10 Å

(3) 20 Å (4) 25 Å

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

### Choices

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

a. | 1 and 2 are correct | |

b. | 2 and 4 are correct | |

c. | 1 and 3 are correct | |

d. | 1, 2 and 3 are correct |

## Question number: 1173

» Properties of Solids & Liquids » Heat Transfer » Radiation

### Question

An ice box used for keeping eatable cold has a total wall, area of 1 meter ^{2} and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is *K = * 0.01 joule/meter °C is filled with ice at 0° C along with eatables on a day when the temperature is 30°C. The latent heat of fusion of ice is 334 × 10 ^{3} joules/kg. The amount of ice melted in one day is (1 day = 86, 400 seconds)

### Choices

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

a. | 1552 gm | |

b. | 776 gm | |

c. | 11520 gm | |

d. | 7760 gm |