21) Sahil took a loan for 6 years at the rate of 5% per annum on Simple Interest, If the total interest paid was Rs. 1230, the principal wa
- 1) 4100
- 2) 4200
- 3) 4300
- 4) 4400
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Ans. A
Explanation :
\begin{aligned}
\text{S.I.} = \frac{P*R*T}{100} \=> P = \frac{S.I. * 100}{R*T}
\end{aligned}
By applying above formula we can easily solve this question, as we are already having the simple interest.
\begin{aligned}
=> P = \frac{1230 * 100}{6*5} \=> P = 4100
\end{aligned}
22) There was simple interest of Rs. 4016.25 on a principal amount at the rate of 9%p.a. in 5 years. Find the principal amou
- 1) Rs 7925
- 2) Rs 8925
- 3) Rs 7926
- 4) Rs 7925
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Ans. B
Explanation :
\begin{aligned}
P = \frac{S.I. * 100}{R*T}
\end{aligned}
So by putting values from our question we can get the answer
\begin{aligned}
P = \frac{4016.25 * 100}{9*5} \ = 8925
\end{aligned}
23) Find the rate at Simple interest, at which a sum becomes four times of itself in 15 year
- 1) 10%
- 2) 20%
- 3) 30%
- 4) 40%
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Ans. B
Explanation :
Let sum be x and rate be r%
then, (x*r*15)/100 = 3x [important to note here is that simple interest will be 3x not 4x, beause 3x+x = 4x]
=> r = 20%
24) The disease caused by deficiency of protein in children is calle
- 1) Pellagra
- 2) Marasmus
- 3) Beri-Beri
- 4) Rickets
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25) Bamboo is classified a
- 1) Bush
- 2) Tree
- 3) Grass
- 4) Weed
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26) Photosynthesis generally takes place in which parts of the pla
- 1) Steam and leaf
- 2) Leaf and other chloroplast bearing plants
- 3) Bark and leaf
- 4) Roots and chloroplast bearing plants
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27) Plants synthesis protein fr
- 1) Starch
- 2) Sugar
- 3) Fatty acids
- 4) Amino acids
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28) Plants absorb dissolved nitrates from soil and convert them into
- 1) Free nitrogen
- 2) Urea
- 3) Proteins
- 4) Ammonia
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29) Which of the following gases readily combines with the haemoglobin of the blood
- 1) Carbon monoxide
- 2) Methene
- 3) Oxygen
- 4) Nitrogen dioxide
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30) Human blood is a viscous fluid due
- 1) Platelets in plasma
- 2) Proteins in blood
- 3) RBC and WBC in blood
- 4) Sodium in serum
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