Last seen: Jul 17, 2023
(i) 7/4 Divide the line between the whole numbers into 4 parts. i.e., divide the line between 0 and 1 to 4 parts, 1 and 2 to 4 parts and so on. Th...
(i) Zero has no reciprocal. (ii) The numbers -1 and 1 are their own reciprocals (iii) The reciprocal of -5 is -. (iv) Reciprocal of 1/x, where x...
(i) The rational number that does not have a reciprocal is 0. Reason: 0 = Reciprocal of 0 = , which is not defined. (ii) The rational number...
3 = 0.3 = [Multiplicative inverse ⟹ product should be 1] According to the question, × = 1 Therefore, 0.3 is the multiplicative inverse o...
-1 = [Multiplicative inverse ⟹ product should be 1] According to the question, 8/9 × (-7/8) = -7/9 ≠ 1 Therefore, 8/9 is not the multiplicati...
1/3 × (6 × 4/3) = (1/3 × 6) × 4/3 Here, the way in which factors are grouped in a multiplication problem, supposedly, does not change the product. ...
Reciprocal of -7/16 = 16/-7 = -16/7 According to the question, 6/13 × (Reciprocal of -7/16) 6/13 × (-16/7) = -96/91
(i) -4/5 × 1 = 1 × (-4/5) = -4/5 Here 1 is the multiplicative identity. (ii) -13/17 × (-2/7) = -2/7 × (-13/17) The property of commutativity is ...
(i) -13 Multiplicative inverse of -13 is -1/13 (ii) -13/19 Multiplicative inverse of -13/19 is -19/13 (iii) 1/5 Multiplicative inverse of 1/...
(i) x = 11/15 We have, x = 11/15 The additive inverse of x is – x (as x + (-x) = 0) Then, the additive inverse of 11/15 is – 11/15 (as 11/15 + (...
(i) 2/8 Additive inverse of 2/8 is – 2/8 (ii) -5/9 Additive inverse of -5/9 is 5/9 (iii) -6/-5 = 6/5 Additive inverse of 6/5 is -6/5 (iv) ...
(i) -2/3 × 3/5 + 5/2 – 3/5 × 1/6 -2/3 × 3/5 + 5/2 – 3/5 × 1/6 = -2/3 × 3/5– 3/5 × 1/6+ 5/2 (by commutativity) = 3/5 (-2/3 – 1/6)+ 5/2 = 3/5 ((...
Air and water, because both air and water can be used again and again endlessly, they never get exhausted.
Fossil fuels are known as non-renewable sources of energy because fossil fuels once used cannot renewed or regained.
Renewable source of energy can be used again and again endlessly, where as non-renewable source of energy cannot be renewed once used. Ex. Renewable...
A renewable source of energy is the one which is being produced continuously in nature and is inexhaustible. Ex. wind energy, ocean thermal energy e...
A non-renewable source of energy is defined as the source of energy which has accumulated in nature over a very, very long time and cannot be quickly ...
A good source of energy is one: (i) which would do a large amount of work per unit mass, (ii) which is cheap and easily available, (iii) which i...
A source of energy is one which can provide adequate amount of energy in a convenient form over a long period of time. Two main categories of the so...
The amount of heat produced by burning a unit mass of a fuel completely is known as its calorific value.