A) continue going upwards uninterrupted | B) reach a particular height and remain floating |

C) burst after reaching some height | D) reach a particular height and start coming down |

Explanation:

It will stop at a height where the weight of the balloon with contents is equal to the weight of air displaced by it, i.e , when the upthrust is equal to the downthrust. The question of bursting will depend on how much difference of pressure inside and outside , the material of the balloon can withstand. It is assumed the balloon is filled with a lighter than air gas like hydrogen or helium.

A) Kinetic Energy | B) Weight |

C) Potential Energy | D) Impulse |

Explanation:

Rate of change of impulse equals the force . In case of freely falling body the only force is the weight.

A) Depends on their masses | B) Sphere |

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

Explanation:

Time does not depend on mass, else

=> is least for 'sphere' and

hence least time is taken by sphere.

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

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

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.

A) A | B) B |

C) C | D) D |

Explanation:

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

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

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