Questions

Q:

An electric iron of 750 W is used for S hours per day. Then the energy consumed in one day by the iron is:

A) 6 units B) 600 units
C) 0.6 units D) 60 units
 
Answer & Explanation Answer: A) 6 units

Explanation:
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Q:

For a certain reaction,DGq = -45 kJ/mol and DHq= -90 kJ/mol at 0°C. What is the minimum temperature at which the reaction will become spontaneous, ifDHq and DSq are independent of temperature?

A) 273 K B) 298 K
C) 546 K D) 596 K
 
Answer & Explanation Answer: C) 546 K

Explanation:

T = 273 °K

Using the formula,

DGq = DHq –TDS

-45 = -90 –273 DS

DS = 0.164

Now since DHq and DSq are independent,T2= DH/DS = 45/0.164 = 273°K

Required Temp = 273 + 273 = 546°K

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Q:

The fact that the planets move around the Sun, not in circles but in ellipses, was first demonstrated by

A) Galileo B) Martin Luther
C) Johannes Kepler D) Copernicus
 
Answer & Explanation Answer: C) Johannes Kepler

Explanation:

Kepler’s  laws  of  planetary  motion state  that  (a)  All  planets  move  in elliptical orbits with the Sun at one of  the  focal  points  (b)  The  radius vector  drawn  from  the  sun  to  a planet  sweeps  out  equal  areas  in equal  time  intervals.  This  follows from  the  fact  that  the  force  of gravitation on the planet is central and  hence  angular  momentum  is conserved.  (c)  The  square  of  the orbital   period   of   a   planet   is proportional  to  the  cube  of  the semi  major  axis  of  the  elliptical orbit of the plane.

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Q:

Hormone that helps regulate calcium balance

A) endocrine B) parathyroid
C) pancreas D) None of the above
 
Answer & Explanation Answer: B) parathyroid

Explanation:

PTH - Parathyroid hormone which balances calcium levels if they are low.

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Filed Under: General Science
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Q:

Which gas in the atmosphere is essential for respiration?

A) Argon B) Carbon dioxide
C) Oxygen D) Nitrogen
 
Answer & Explanation Answer: C) Oxygen

Explanation:

Inhaling of oxygen and releasing of carbon dioxide to make our living is the process called as respiration. We know that, air is a mixture several gases like 78% of nitrogen, 21% of oxygen and several other gases with watervapour.

 

Hence, Oxygen is essential for respiration process.

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Filed Under: General Science
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Q:

When was Zoroastrianism founded?

A) 4th century BCE B) 6th century BCE
C) 8th century BCE D) 10th century BCE
 
Answer & Explanation Answer: B) 6th century BCE

Explanation:

Zoroastrianism is one of the world's oldest extant religions. It is the ancient pre-Islamic religion of Iran that survives there in isolated areas and, more prosperously, in India, where the descendants of Zoroastrian Iranian (Persian) immigrants are known as Parsis, or Parsees.

 

The Iranian prophet and religious reformer Zarathustra flourished before the 6th century BCE more widely known outside Iran as Zoroaster is traditionally regarded as the founder of the religion.

 

Zoroastrianism contains both monotheistic and dualistic features. It likely influenced the other major Western religions—Judaism, Christianity, and Islam.

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Filed Under: World History
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Q:

Give a circuit to divide frequency of clock cycle by two?

Answer

You can divide the frequency of a clock by just implementing T Flip flop.


Give clock as clock input and tie the T input to logic 1.

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Subject: Hardware

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Q:

The International chriminal Police Organisation has its headquaters at

A) Paris B) Rio de Janeiro
C) Dar es Salam D) None of these
 
Answer & Explanation Answer: A) Paris

Explanation:
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