📢 1800+ Railway Questions & RRB Study Material🚀
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For the following questions answer them individually
Find the standard deviation of first 'n' natural numbers?
$$\sqrt{\frac{{n^{2}+1}}{6}}$$
n$$(\frac{{n+1}}{12})$$
$$\sqrt{\frac{{n^{2}-1}}{12}}$$
$$n(\frac{{2n+1}}{3})$$
An alloy is a/an?
Element
Compound
Homogenous mixture
Heterogeneous mixture
Simplify $$1035\div[\frac{3}{4}(71+65)-15\frac{3}{4}]$$
12
20
18
24
The liver oil of fish is rich in?
Vitamin D
Both Vitamin D and vitamin A
Vitamin E
Vitamin A
Find the square root of$$ \frac{a^{2}}{b^{2}}$$ +$$\frac{b^{2}}{a^{2}}$$+2
$$ \frac{a}{b}$$Â -$$ \frac{b}{a}$$
$$ \frac{a-b}{2}$$Â
$$ \frac{a}{2b}$$Â -$$ \frac{b}{2a}$$
$$ \frac{a}{b}$$ +$$ \frac{b}{a}$$
Find the mean of the first 10 consecutive odd numbers.
11
13
15
10
In a certain code, 15789 is written as 'EGKPT' and 2346 is written as 'ALUR'. How is 23549 written in that code?
ALEUT
ALGTU
ALGUT
ALGRT
Which of the following is more environmental friendly?
Burning of charcoal
Burning of wood
Burning of diesel
Burning of coal
Substances whose odour changes in acidic or basic media are called?
Acidic indicators
Both acidic and basic indicat
Olfactory indicators
Basic indicators
Find the missing group of alphabets in the following series.BV, ET, HR, KP, (…), QL
UV
QP
NN
PQ
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