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) K1k2/k1+k2 | B) 2k1k2/k1+k2 |

C) K1+k2/k1k2 | D) None |

Explanation:

We know that,

**The equivalent K = **

where L1 & L2 are plate1 & Plate2 thicknesses, K1 & K2 are coefficient thermal conductivity of plate1 & Plate2 respectively.

But here L1 = L2 = L (say)

Then **K** = **L+L/(L/K1 + L/K2)** =

A) Acceleration | B) Distance |

C) Light Intensity | D) Weight |

Explanation:

A Light-year is a distance that light travels in the vacuum in one Julian year (365.25 days).

The light-year is a unit of length used to express astronomical distances. It is about 9.5 trillion kilometers or 5.9 trillion miles.

A) Planetary Motion | B) Law of Conservation of energy |

C) Law of Gravitation | D) None |

Explanation:

**Kepler's laws** of **planetary motion** are three scientific laws describing the motion of planets around the Sun.

- Kepler’s three laws of planetary motion can be stated as follows:

**(1)** All planets move about the Sun in elliptical orbits, having the Sun as one of the foci.

**(2)** A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time.

**(3)** The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun.

A) Pascal's Law | B) Boyle's law |

C) Coulomb's law | D) Bernouli's law |

A) Radio Detecting and Ranging | B) Region Device and Ranging |

C) Radio Detect and Rangs | D) Radio Device and Ranging |