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Find the HCF and LCM of 117 and 221.

Solution: Given numbers are 117 and 221. Prime factorise the numbers. 117 = 32×13 221 = 13×17 Common factor is 13. So HCF = 13... View Article

The relationship between frequency (f) and time period (T) is given by

(a) f = T (b) f = 1/T (c) f2 = T (d) f3 = T Solution: Frequency (f) and time period (T) are reciprocals. So f = 1/T. Hence option... View Article

Find the derivative of cos x from first principle.

Solution: f’(x) = limh→ 0 [f(x+h) - f(x)]/h = limh→ 0 [cos (x+h) - cos x]/h = limh→ 0[cos x cos h - sin x sin h - cos... View Article

The typing speed is measured in

Answer: The typing speed is measured in words per minute.... View Article

In a fraction, twice the numerator is 2 more than the denominator. If 3 is added to the numerator and to the denominator the new fraction is 2/3. Find the original number.

Solution. Let a be the numerator, then denominator = 2a-2 Given (a+3)/(2a-2+3) = 2/3 => (a+3)/(2a+1) = 2/3 Cross multiply => 3(a+3) =... View Article

A solar cell converts solar energy into

(a) electric energy (b) chemical energy (c) light energy (d) None of these Solution: A solar cell converts solar energy into electrical... View Article

All squares are — (similar, congruent)

Answer: All squares are similar.... View Article

Find a and b if (a+ib) (1+i) = 2+i

Solution: Given (a+ib) (1+i) = 2+i => a+ib+ai-b = 2+i Comparing real and imaginary terms a-b = 2…(i) a+b = 1…(ii) Adding... View Article

What is the chemical formula of ferrous sulphate?

Answer: Chemical formula of ferrous sulphate is FeSO4.... View Article

When sodium sulphate solution reacts with barium chloride solution, the solution after the reaction contains

(a) Barium sulphide (b) Sodium chloride (c) both a and b (d) none of a and b Solution: The sodium sulphate reacts with barium... View Article

What is the difference between plant tissue and animal tissue (in tabular form).

Plant tissue Animal tissue Cells of plant tissue have cell wall. Cell wall is not present. Growth is... View Article

A pie has to be divided amongst few kids. Puneet gets 2/7th portion of the pie and Sheela gets 5/8th portion of the pie. Who amongst the two gets lesser share?

Solution: We have to compare 2/7 and 5/8. These are unlike fractions. We have to convert them to like fractions and then compare. LCM of... View Article

M	T	W	T	F	S	S
		1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30

Archives

Find the HCF and LCM of 117 and 221.

The relationship between frequency (f) and time period (T) is given by

Find the derivative of cos x from first principle.

The typing speed is measured in

In a fraction, twice the numerator is 2 more than the denominator. If 3 is added to the numerator and to the denominator the new fraction is 2/3. Find the original number.

A solar cell converts solar energy into

All squares are — (similar, congruent)

Find a and b if (a+ib) (1+i) = 2+i

What is the chemical formula of ferrous sulphate?

When sodium sulphate solution reacts with barium chloride solution, the solution after the reaction contains

What is the difference between plant tissue and animal tissue (in tabular form).

A pie has to be divided amongst few kids. Puneet gets 2/7th portion of the pie and Sheela gets 5/8th portion of the pie. Who amongst the two gets lesser share?

The motion of the earth around the sun is known as

Is energy a vector quantity?

Give the structural formula for ethanal.

Give the feminine gender of these nouns:

Plaster of Paris hardens by

What is the SI unit of wave number?

Who founded the Nalanda University?

Before Delhi, which city was the capital of India under the British Raj?

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