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Which of the following sets of concurrent forces may be in equilibrium? (1) F₁= 3N, F₂ = 5N, F₃ = 1N (2) F₁ = 3N, F₂ = 5N, F3 = 9N (3) F₁ = 3N, F₂ = 5N, F₃ = 6N (4) F₁ = 3N, F₂ = 5N, F₃ = 15N

Answer: (3) F1 = 3N, F2 = 5N, F3 = 6N According to the triangle law of forces If three concurrent forces are to be in equilibrium, the sum of... View Article

A particle P is moving in a circle of radius r with uniform speed v. C is the centre of the circle and AB in diameter. The angular velocity of P about A and C is in the ratio (1) 4 : 1 (2) 1 : 1 (3) 2 : 1 (4) 1 : 2

Answer: (4) 1: 2 Angular velocity is a vector quantity and is described as the rate of change of angular displacement which specifies the... View Article

A car of mass m is driven with acceleration a along a straight level road against a constant external resistive force R. When the velocity of the car is V, the rate at which the engine of the car is doing work will be________

Answer: The capacity to do work is termed Energy. The Energy expended to do work in unit time is termed as Power. It is represented as P. Power... View Article

Earth’s magnetic field always has a horizontal component except at (1) Magnetic poles (2) Magnetic equator (3) Geographical north pole (4) At an altitude of 45^o

Answer: (1) Magnetic poles Except at the magnetic pole, the Earth's magnetic field is always horizontal. At the magnetic pole, the earth's... View Article

The energy required to break one mole of Cl−Cl bonds in Cl2 is 242 kJ mol⁻¹. The longest wavelength of light capable of breaking single Cl−Cl bond is__________ (c = 3 × 10⁸ msec⁻¹, N_A = 6.023 × 10²³mol⁻¹) (1) 700nm (2) 640nm (3) 594nm (4) 492 nm

Answer: (4) 492 nm Bond energy is required to break the bond. Since breaking a bond requires energy, bond-energies are usually positive numbers.... View Article

If the p^th term of an AP is q and the q^th term is p, prove that its n^th term is (p + q – n).

Answer: A sequence of numbers that has a common difference between any two consecutive numbers is called an arithmetic progression (A.P.). The... View Article

An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the % increase in the apparent frequency? (1) Zero (2) 0.5% (3) 5% (4) 20%

An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the % increase in the... View Article

The correct statement for the molecule CsI₃ is that (1) it contains Cs⁺,I⁻ and lattice I₂ molecule (2) it contains Cs³⁺ and I⁻ ions (3) it is a covalent molecule (4) it contains Cs⁺ and I³⁻ ions

Answer: (4) it contains Cs+ and I-3 ions CsI3 → Cs+ + I3– CsI3 contains Cs+ and I3–. It is an ionic compound. Cs cannot... View Article

State the law of conservation of angular momentum and explain with a suitable example.

Answer: . The law of conservation of angular momentum states that when no external torque acts on an object, no change of angular momentum will... View Article

Which condition is not satisfied by an ideal solution? (1) Δ_mixH = 0 (2) Δ_mixV = 0 (3) Δ_mixS = 0 (4) Obeyance of Raoult’s law

Answer: (3) ΔmixS = 0 An ideal solution is a mixture in which the molecules of different species are distinguishable, however, unlike the... View Article

Not considering the electron spin, the degeneracy of second excited state is 9, while the generality of the first excited state of H atom is (1) 1 (2) 2 (3) 3 (4) 4

Answer:(1) 1 Electron orbitals having the same energy levels are called degenerate orbitals. Single electron species don't follow the H rule and... View Article

Jahn-Teller effect is not observed in high spin complexes of (1) d⁴ (2) d⁹ (3) d¹⁰ (4) d⁷

Answer: (3) d10 The geometrical distortion of molecules and ions caused by particular electron configurations is known as the John-Teller effect... View Article

How to find the inverse of 3 x 3 matrix?

Answer: If A is a non-singular square matrix, there is an existence of n x n matrix A-1, which is called the inverse matrix of A such that it... View Article

How to find the inverse of the matrix?

Answer: If A is a non-singular square matrix, there is an existence of n x n matrix A-1, which is called the inverse matrix of A such that it... View Article

How many even numbers are there between 1 to 100?

Answer: Any number that can be exactly divided by 2 is called as an even number. Even numbers always end up with the last digit as 0, 2, 4, 6 or... View Article

According to Fajan’s rule, covalent bond is favoured by (1) Small cation and large anion (2) Small cation and small anion (3) Large cation and large anion (4) Large cation and small anion

According to Fajan’s rule, covalent bond is favoured by (1) Small cation and large anion (2) Small cation and small anion (3) Large cation... View Article

If 3 is the least prime factor of number a and 7 is the least prime factor of number b,then the least prime factor of a+b is (1) 2 (2) 3 (3) 5 (4) 10

Answer: (1) 2 Prime factorisation is a method to find the prime factors of a given number, say a composite number. These factors are nothing but... View Article

The number of integral values of m, for which the x-coordinate of the point of intersection of the lines 3x + 4y = 9 and y = mx + 1 is also an integer is (1) 0 (2) 2 (3) 4 (4) 1

Answer: (2) 2 Given eqaution 3x + 4y = 9__________(1) y = mx + 1___________(2) Substitute the eqaution (2) in eqaution (1), we get 3x + 4(mx... View Article

The weight of silver displaced by a quantity of electricity which displaces 5600 ml of O₂ at STP will be (1) 5.4g (2) 108.0g (3) 54.0g (4) 10.8g

The weight of silver displaced by a quantity of electricity which displaces 5600 ml of O<sub>2</sub> at STP will be (1) 5.4g (2)... View Article

If the electric flux entering and leaving an enclosed surface respectively are ϕ1 and ϕ2, the electric charge inside the surface will be (1) (ϕ2−ϕ1)/ε0 (2) (ϕ2+ϕ1)/ε0 (3) (ϕ1−ϕ2)/ε0 (4) ε0(ϕ2−ϕ1)

Answer: (4) ε0(ϕ2−ϕ1) Gauss Law states that the total electric flux out of a closed surface is equal to the charge enclosed... View Article

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