Q:

A) will increase | B) will decrease |

C) does not change | D) varies with the increase of depth of the immersion of the iron piece |

Answer: A) will increase

Explanation:

Explanation:

When the piece of iron is lowered into the water, the water level in the bucket increases. And so the pressure at the bottom of bucket also increases. Thus the total thrust at the botto also increases. Therefore the spring balance reading increases.

Q:

A) Depends on their masses | B) Sphere |

C) Disk | D) Both reach at the same time |

Answer & Explanation
Answer: B) Sphere

Explanation:

Explanation:

Time does not depend on mass, else

=> is least for 'sphere' and

hence least time is taken by sphere.

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58

Q:

A) 3:4 | B) 5:4 |

C) 5:1 | D) 3:2 |

Answer & Explanation
Answer: D) 3:2

Explanation:

Explanation:

In series : E1 + E2 = K(50)

In parallel : E1 - E2 = K(10)

E1 + E2 / E1 - E2 = 5/1

=> E1/E2 = 3/2

The emf's are in the ratio of 3:2.

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72

Q:

A) A | B) B |

C) C | D) D |

Answer & Explanation
Answer: C) C

Explanation:

Explanation:

To complete the vertical loop, the minimum speed required at the lowest point = .

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17

Q:

A) Argon, copper, silver | B) Hydrogen, argon, copper |

C) Oxygen, copper, silver | D) Hydrogen, oxygen, Argon |

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26

Q:

A) Diamagnetic materials | B) Non-magnetic materials |

C) Paramagnetic materials | D) None of the others |

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18