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Matter in our surroundings

Convert the following temperatures to the celsius scale.
(a) 293 K (b) 470 K

Matter in our surroundings

What type of clothes should we
wear in summer?

Matter in our surroundings

Why are we able to sip hot tea or
milk faster from a saucer rather
than a cup?

Matter in our surroundings

Why does our palm feel cold
when we put some acetone or
petrol or perfume on it?

Matter in our surroundings

How does the water kept in an
earthen pot (matka) become cool
during summer?

Matter in our surroundings

Why does a desert cooler cool
better on a hot dry day?

Pair of Liner Equation in Two Variable

The father’s age is six times his son’s age. Four years hence, the age of the father will be four times his son’s age. The present ages, in years, of the son and the father are, respectively

(A) 4 and 24 (B) 5 and 30
(C) 6 and 36 (D) 3 and 24

Pair of Liner Equation in Two Variable

Aruna has only Re 1 and Rs 2 coins with her. If the total number of coins that she has is 50 and the amount of money with her is Rs 75, then the number of Re 1 and Rs 2 coins are, respectively
(A) 35 and 15 (B) 35 and 20
(C) 15 and 35 (D) 25 and 25

Pair of Liner Equation in Two Variable

If x = a, y = b is the solution of the equations x – y = 2 and x + y = 4, then the values of a and b are, respectively
(A) 3 and 5 (B) 5 and 3
(C) 3 and 1 (D) –1 and –3

Pair of Liner Equation in Two Variable

A pair of linear equations which has a unique solution x = 2, y = –3 is
(A) x + y = –1, 2x – 3y = –5

(B) 2x + 5y = –11 , 4x + 10y = –22

(C) 2x – y = 1 , 3x + 2y = 0

(D) x – 4y –14 = 0,  5x – y – 13 = 0