# NEET Physics: Questions 1213 - 1217 of 2099

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## Question number: 1213

» Properties of Solids & Liquids » Elastic Behavior

### Question

A wire of cross sectional area 4mm ^{2} is just stretched between two fixed points at a temperature of 20°C. Determine the tension when the temperature falls to 20°C. Coefficient of linear expansion a = 10 ^{-5} /°C and Y = 2 × 10 ^{11} N/m ^{2}.

### Choices

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

a. | 220 N | |

b. | 120 KN | |

c. | 160 N | |

d. | 120 N |

## Question number: 1214

» Wave Optics » Young's Double Slit Experiment

### Question

The intensity of the light coming from one of the slits in a young’s double slit experiment is double the intensity from the other slit. Find the ratio of the maximum intensity to the minimum intensity in the interference fringe pattern observed.

### Choices

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

a. | 9: 1 | |

b. | 34: 1 | |

c. | 4: 1 | |

d. | 16: 1 |

## Question number: 1215

» Wave Optics » Wavefront

### Question

When a wave of wavelength 0.2 cm is made incident normally on a slit of width 0.004m, then the semi-angular width of central maximum of diffraction pattern will be

### Choices

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

a. | 0° | |

b. | 30° | |

c. | 60° | |

d. | 90° |

## Question number: 1216

» Properties of Solids & Liquids » Heat Transfer » Conduction

### Question

A wall is made up of two layers *A * and *B. * The thickness of the two layers is the same, but materials are different. The thermal conductivity of *A * is double than that of *B. * In thermal equilibrium the temperature difference between the two ends is 30°C. Then the difference of temperature at the two surfaces of *A * will be

### Choices

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

a. | 12°C | |

b. | 10°C | |

c. | 24°C | |

d. | 18°C |

## Question number: 1217

» Properties of Solids & Liquids » Surface Energy and Surface Tension

### Question

A film of water is formed between two straight parallel wires of length 15 cm each separated by 0.5 cm. If their separation is increased by 1 mm while still maintaining their parallelism, how much work will have to be done (Surface tension of water = 70 × 10 ^{-2} N/m)

### Choices

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

a. | 2.16 × 10 | |

b. | 1.44 × 10 ^{-5} Joule | |

c. | 7.22 × 10 | |

d. | 5.76 × 10 |