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What is natural and artificial indicator? Give some examples.

Natural indicators are those indicators which obtained from natural sources are called natural indicators. Eg- litmus, turmeric, red cabbage,... View Article

The metal whose salts are sensitive to light is? (A) Zinc (B) Silver (C) Copper (D) Aluminium

Answer: (B) Silver The salts formed by silver are sensitive to light. The silver salts are formed between silver and one of the halogens. Mainly... View Article

How much per cent above the cost price should a shopkeeper marks his goods so that after allowing a discount of 20% on the Marked price, he gains 12%

Let us assume the CP be Rs. 100 Let the MP be Rs. x Gain % after discount= 12% Gain = 12% of 100 = Rs. 12 ⇒ SP of the article = CP + Gain =... View Article

Prove that a cyclic parallelogram is a rectangle

Let ABCD be a cyclic quadrilateral such that its diagonals AC and BD are the diameters of the circle through the vertices A, B, C, and D. As... View Article

The associative property is applicable to:- (a) Addition and subtraction (b) Multiplication and division (c) addition and multiplication (d) subtraction and division

Answer: (c) addition and multiplication This property states that when three or more numbers are added (or multiplied), the sum (or the product)... View Article

Find the value of cos (18 degrees)

Let A = 18° 5A = 90° 2A = 90 - 3A Sin 2A = Sin (90-3A) = Cos 3A 2 Sin A Cos A = 4Cos3 A - 3 Cos A , Cancel Cos A as it is not zero. 2 Sin A... View Article

Which term of an AP 21, 18, 15, …. is zero?

Answer: A mathematical sequence in which the difference between two consecutive terms is always a constant is known as Arithmetic... View Article

Which term of AP 53, 48, 43… is the first negative term?

Answer: A mathematical sequence in which the difference between two consecutive terms is always a constant is known as Arithmetic... View Article

The number of significant figures in 0.06900 is (a) 5 (b) 4 (c) 2 (d) 3

The significant figures of a number are those which adds the valuable importance to the number. The number of significant figures in 0.06900 is... View Article

Solve: 6xy – 4y + 6 – 9x.

Given the expression 6xy-4y+6-9x We have to factorize the above expression Expression: 6xy–4y+6–9x = 6xy–9x–4y+6 Taking 3x common from the... View Article

What is the additive inverse of -(-2/3)?

Additive inverse means the number when added to a certain number we get the sum zero. An additive inverse of a number is defined as the value,... View Article

2 women and 5 men can together finish an embroidery work in 4 days, while 3 women and 6 men can finish it in 3 days. Find the time taken by 1 women alone to finish the work , and also that taken by 1 man alone.

Let the number of days taken by a woman and a man be x and y. ⇒ 4(2/x + 5/y) = 1 ⇒ 2/x + 5/y = 1/4 ⇒ 3(3/x + 6/y) = 1 ⇒ 3/x +... View Article

Find the mean of first five natural numbers.

The first five natural numbers are : 1,2,3,4,5 Mean =Sum of observations / Number of observations (1+2+3+4+5) / 5 = 15/5 = 3 Answer Mean of... View Article

Every rational number is a real number. State whether the given statement is true or false. Justify

The given statement is False Justification A set of real numbers consist of both rational and irrational numbers. Therefore, every real number... View Article

The reciprocal of a negative rational number is ___________.

Answer: The reciprocal of a negative rational number is negative. In Mathematics, reciprocal means an expression which when multiplied by... View Article

What is additive identity in whole numbers?

Answer: Additive identity is a property of numbers that are applied when carrying out addition operations. It is the number which when added to... View Article

A long-distance train is scheduled to reach its destination in 19 hours. After 10 hours of journey, due to disruption of rail traffic, the train has to be stationed for 1 hour. If the average speed of the train is 100km/hr, at what speed should it travel to cover the distance in same amount of time?

Given that Total journey time = 19 hours The train has completed a 10-hour journey. The average speed of train is 100km/hr. So the total... View Article

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