Force can be measured in:
Force can be measured in Newton (N) ir Kgm/s2. Force is equal to the product of mass of the body... View Article
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One nanometre is equal to what?
1 nanometer is equal to 10 raised to the power -9 in meters. 1nm = 10-9 m
What is the biggest unit of length? (A) Kilometer (B) Hectometer (C) Decameter (D) Decimeter
Answer: (A) 1 Kilometer
Derive the formula P = VI of electric power
Power is equal to rate of change of electrical potential energy. P = dU/dt U = V.dQ P = d(V.dQ)/dt... View Article
The temperature coefficient of resistance of a semiconductor? A. Is always positive B. Is always negative C. Is zero D. May be positive or negative or zero
Answer: B. Is always negative The temperature coefficient of resistance of a semiconductor is always negative. The temperature coefficient of resistance is... View Article
How much water a pump of 2kW can raise in one minute to a height of 10 m. Take g = 10 m/s2?
Answer: Given, Power of the motor pump = 2 kW = 2000 W Time (t)= 60 sec Height (h) =... View Article
Factorize : a6 – b6 (a) (b – a) (a + b) (a3 + ab + b3) (a2 – ab + b2) (b) (a – b) (a + b) (a2 + ab + b2) (a2 – ab + b2) (c) (a + b) (a + b) (a2 + ab + b2) (2a2 – ab + b2) (d) (a + b) (a – b) (a2 + ab + b2 (a3 – ab + b3)
Given a6 – b6 This can be written as below = (a2)3 – (b2)3 Using the formula: (a3 – b3)... View Article
Using the formula, tan 2A = 2 tan A / 1 – tan2A, find the value of tan 600, it being given that tan 300 = 1/√3
Put A = 300 2A = 600 tan 600 = 2 tan 300 / (1 – tan2 300) Given tan... View Article
Check whether the given equation is quadratic equation x2 – 2x = (-2)(3-x)
Given x2 – 2x = (-2) (3 – x) By using the formula for (a+b)2 = a2 + 2ab +... View Article
At a cricket test match 2/7 of the spectators were in a covered place while 15000 were in open. Find the total number of spectators
Given Fraction of spectators covered = 2/7 Fraction left = 1 – 2/7 We get, = 5/7 Number of spectators... View Article
Two poles of equal height are standing opposite to each other on the either side of the roads, which is 80 m wide. From a point P between them on the road , the angle of elevation of the top of a pole is 60°and the angle of depression from the top of another pole at point P is 30°. Find the heights of the poles and distances of the point P from the poles.
Let us consider AC and BD as the two poles of the same height h m Given AB = 80... View Article
The larger of two supplementary angles exceeds the smaller by 18 degrees. Find the angles.
Let the larger angle = x<sup>0</sup> and smaller angle = y<sup>0</sup> We know that the sum of two supplementary pair... View Article
Write the successor of: (a) 2440701 (b) 100199 (c) 1099999 (d) 2345670
The successors are (a) 2440701 + 1 = 2440702 (b) 100199 + 1 = 100200 (c) 1099999 + 1 =... View Article
Define a reflexive relation
In relation and functions, a reflexive relation is the one in which every element maps to itself. For example, consider... View Article
The difference between two numbers is 26 and one number is three times the other. Find them?
Let the two numbers be x and y respectively, such that y > x. According to the question, y =... View Article
4522 is not divided by
To find the numbers by which 4522 is not divisible let us first find the factors of 4522. Each number... View Article
Factorise 3x square – x – 4
Given polynomial = 3x2 – x – 4 This can be written as, = 3x2 + 3x – 4x –... View Article
The arithmetic mean of 1, 2, 3 … n is (a) (n-1)/2 (b) (n+1)/2 (c) n/2 (d) n
We know sum of first n natural numbers, (1+2+3+…n) = n(n+1)/2 Arithmetic mean of first n natural numbers = (1+2+3+…n)/n... View Article
Solve the following mentioned question (-7)-(-5)
Let us consider x = (-7)-(-5) x = -7 + 5 We get, x = -2
Prove that the sum of a rational number and an irrational number is always irrational
Let us consider a is a rational number and b is an irrational number Then ab is irrational Example: a... View Article
