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If the points (a, 0), (0, b) and (1, 1) are collinear then which of the following is true?

(a) 1/a + 1/b = 1(b) 1/a - 1/b = 2(c) 1/a - 1/b = -1(d) 1/a + 1/b = 2Correct option: (a) 1/a + 1/b = 1Let the given points be:A(a, 0) = (x1,... View Article

Wobbe Index is a characteristic of ____________.

(a) Solid fuels(b) Gaseous fuels(c) Liquid fuels(d) Fat coalsCorrect option: (b) Gaseous fuelsWobbe Index is a characteristic of Gaseous fuels.... View Article

Use suitable identity to solve (1.1m − 0.4)(1.1m + 0.4).

(1.1m − 0.4)(1.1m + 0.4)Using the identity (a - b)(a + b) = a2 - b2,(1.1m − 0.4)(1.1m + 0.4) = (1.1m)2 - (0.4)2= 1.21m2 - 0.16... View Article

An ideal refrigerator has a freezer at a temperature of -13°C, The coefficient of performance of the engine is 5. The temperature of the air to which heat is rejected will be

(a) 325°C (b) 39°C (c) 325 K (d) 320°CCorrect option: (b) 39°CGiven, temperature of freezer = T2 = –13°C = –13 +... View Article

0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete neutralisation. The molecular weight of the acid will be

(a) 32(b) 64(c) 128(d) 256Correct option: (c) 128Given that 0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete... View Article

Write the general form of a quadratic polynomial.

The general form of a quadratic polynomial is: ax2 + bx + c; where a, b, c are real numbers and a ≠ 0.... View Article

Phanerogamae are

(a) Seed plants in which sex organs are evident(b) Non-seed plants(c) Non-seed plants in which sex organs are hidden(d) None of the aboveCorrect... View Article

Lignified cell wall is characteristic feature of

(a) Vessels(b) Sieve cells(c) Sieve tubes(d) All the aboveCorrect option: (a) VesselsLignified cell wall is characteristic feature of vessels.... View Article

Calculate the Bohr’s radius for the fifth orbit of the hydrogen atom.

We know that,Radius of Bohr's nth orbit of the hydrogen atom is rn = (0.0529 nm)n2For fifth orbit, radius will be:r5 = (0.0529 nm) × 52=... View Article

Add without using number line: (-380) + (-270)

(-380) + (-270)= -380 - 270= -650Therefore, the addition of -380 and -270 gives the result -650.... View Article

Hydrogen peroxide is reduced by

(a) Ozone(b) Barium peroxide(c) Acidic solution of KMnO4(d) Lead sulphide suspensionCorrect option: (d) Lead sulphide suspensionHydrogen peroxide... View Article

A circular disc is to be made by using iron and aluminium so that it acquired maximum moment of inertia about geometrical axis. It is possible with

(a) aluminium at interior and iron surround to it (b) iron at interior and aluminium surround to it (c) using iron and aluminium layers in... View Article

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