What is the actual time rotation of Earth?
A. 12hours 45mins 4sec
B. 20hours 36mins 4sec
C. 23hours 56mins 4sec
D. 25hours 32mins 4sec
C. 23hours 56mins 4sec
What is the actual time rotation of Earth? Read More »
Selected MCQs
How long does it take for the moon to orbit the earth once?
A. 26.3 days
B. 27.3 days
C. 28.3 days
D. 30.3 days
B. 27.3 days
How long does it take for the moon to orbit the earth once? Read More »
The outermost layer of skin is the__________?
A. endodermis
B. dermis
C. epidermis
D. hypodermis
C. epidermis
The outermost layer of skin is the__________? Read More »
Einstein’s famous equation which states that mass and energy are interchangeable is?
A. E = mc²
B. E = cm²
C. M = ec²
D. M = ce²
A. E = mc²
Einstein’s famous equation which states that mass and energy are interchangeable is? Read More »
At night, Plants intake __________ and release __________?
A. Oxygen – Carbon dioxide
B. Carbon dioxide – Oxygen
C. Oxygen – Carbon monoxide
D. None of theseCarbon monoxide – Oxygen
A. Oxygen – Carbon dioxide
At night, Plants intake __________ and release __________? Read More »
Sound waves are _________ waves.
A. Transverse
B. Electromagnetic
C. Longitudinal
D. None of these
C. Longitudinal
Sound waves are _________ waves. Read More »
Deficiency of Vitamin-D results in __________?
A. night blindness
B. rickets
C. scurvy
D. hair fall
B. rickets
Deficiency of Vitamin-D results in __________? Read More »
A man buys an article for 10% less than its value and sells it for 10% more than its value. His gain or loss percent is:________?
A. no profit, no loss
B. 20% profit
C. less than 20% profit
D. more than 20% profit
D. more than 20% profit
Let the article be of worth rupees x.
then, as per the statement, the cost price at 10% less value will be:
C.P=[(100-10)/100]*x
C.P=90x/100
C.P=9x/10 rupees
Sells at 10% more value means:
S.P= x*[(100+10)/100]
S.P=110x/100
S.P=11x/10 rupees
As 11x/10 > 9x/10, this means, man has gain percentage.
So,
Gain=S.P-C.P
Gain=11x/10-9x/10
Gain=(11x-9x)/10
Gain=2x/10
Gain=x/5 rupees
But, we need gain%.
So,
Gain%=(Gain/C.P)*100
Gain%=[(x/5)/(9×10)]* 100
Gain%=(x/5÷9x/10)*100
Gain%=[(x/5)*(10/9x)]*100
Gain%=(2x/9x)*100
Gain%=(2/9)*100
Gain%=200/9
or
Gain%=22*(2/9)
So, Profit is more than 20%
The cash difference between the selling prices of an article at a profit of 4% and 6% is Rs. 3. The ratio of the two selling prices is:__________?
A. 51:52
B. 52:53
C. 51:53
D. 52:55
B. 52:53
Let cost price (CP) of the article be X rupees.
For 4% profit, SP=CP+4% of CP = 1.04X
For 6% profit, SP=CP+6% of CP = 1.06X
It is given that cash differences between selling price is Rs 3
1.06X−1.04X=3
0.02X=3
X=150
so,
Selling price of first article = 1.04X
Selling price of first article = 1.04×150
Selling price of first article = 156 Rupees
and,
Selling price of second article = 1.06X
Selling price of second article = 1.06×150
Selling price of second article = 159 Rupees
Ratio of selling prices = 156/159
Ratio of selling prices = 52:53