A) less than | B) Greater than |

C) equal to | D) greater than or equal to |

Explanation:

This orbital velocity at the moon is less because orbital velocity =

where 'r ' is the orbital radius. i.e the distance of the body from the centre of the earth and 'g' is the acceleration due to gravity on the body in question. In the case of the moon both r and g are less than in the case of earth.

A) 300 m | B) 30 m |

C) 3 m | D) 0.3 m |

A) Nature of signal only | B) Nature of medium only |

C) Both (A) and (B) | D) Neither A nor B |

Explanation:

Quality of transmission is governed both by nature of signal and nature of communication channel/medium.

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.