# Exams

A) 360 | B) 180 |

C) 90 | D) 60 |

Explanation:

Angle traced by the hour hand in 6 hours=(360/12)*6

A) 110 | B) 120 |

C) 130 | D) 140 |

Explanation:

let length = x and breadth = y then

2(x+y) = 46 => x+y = 23

x²+y² = 17² = 289

now (x+y)² = 23²

=> x²+y²+2xy= 529

=> 289+ 2xy = 529

=> xy = 120

area = xy = 120 sq.cm

A) 0.754 | B) 0.854 |

C) 0.954 | D) 0.654 |

Explanation:

log 27 = 1.431

log$\left({3}^{3}\right)$ = 1.431

3 log 3 = 1.431

log 3 = 0.477

log 9 = log(${3}^{2}$)= 2 log 3 = (2 x 0.477) = 0.954

A) Ganga | B) Yamuna |

C) Indus | D) Ravi |

Explanation:

Two sub groups of Himalayan Rivers are Trans Himalayan Rivers and Himalayan Rivers.

**Trans Himalayan Rivers :**

These rivers originate beyond the Himalayas. They are** The Indus, The Sutlej **and** The Brahmaputra Rivers.**

**Himalayan Rivers :**

These are the rivers originate from Himalayas. They are** The Ganga, The Yamuna and their tributaries.**

A) Kadphises I | B) Kanishka |

C) Alexander | D) Menander |

Explanation:

The Saka Era was founded by Kanishka, the emperor of Kushana empire from the year 78 A.D.

A) Compiler | B) Loader |

C) Operating system | D) Assembler |

Explanation:

An operating system is the system software that handles the software and hardware resources and provides services for the computer programs. SO without an operating system, a computer cannot "boot".

A) Diffraction of light | B) Dispersion of light |

C) Reflection of light | D) Refraction of light |

Explanation:

A clear cloudless day-time sky is blue because molecules in the air dissipate blue light from the sun more than they dissipate red light. When we look towards the sun at sunset, we see red and orange hues on the grounds because the blue light has been scattered out and away from the line of sight.

A) 55% | B) 65% |

C) 75% | D) 85% |

Explanation:

Let original radius = R.

New radius = $\frac{50}{100}R$= $\frac{50}{100}R$

Original area =$\frac{R}{2}$ and new area = ${\mathrm{\pi R}}^{2}$

$\frac{3{\mathrm{\pi R}}^{2}}{4}*\frac{1}{{\mathrm{\pi R}}^{2}}*100$

Decrease in area = $\mathrm{\pi}{\left(\frac{\mathrm{R}}{2}\right)}^{2}=\frac{{\mathrm{\pi R}}^{2}}{4}$ = 75%