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For the given compound X, the total number of optically active stereoisomers is

(A) 4 (B) 5 (C) 6 (D) 7 The Correct Answer is (D) 7 Solution: The total number of optically active stereoisomers is 7. Explore more such... View Article

The weights of two elements which combine with one another are in the ratio of their:

(A) Equivalent weight (B) Atomic weight (C) Molecular weight (D) All of these The Correct Answer is (B) Atomic weight. Solution: According... View Article

What is the maximum number of emission lines when the excited electron of a hydrogen atom in n = 6 drops to the ground state?

(A) 10 lines (B) 12 lines (C) 15 lines (D) 18 lines The Correct Answer is (C) 15 lines. Solution: The maximum number of emission lines when... View Article

Which of the following is not a state function?

(A) Work (B) Entropy (C) Enthalpy (D) Internal energy The Correct Answer is (A) Work Solution: Work is not a state function. A state... View Article

Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?

(A) Group 2 (B) Group 8 (C) Group 10 (D) Group 18 The Correct Answer is (D) Group 18. Solution: The Group 18 elements are called noble gas.... View Article

If the distance between Na+ and Cl- ions in NaCl crystals is ‘a’ pm. What is the length of the edge of the unit cell?

(A) 2X pm (B) 4X pm (C) X/2 pm (D) X/4 pm The Correct Answer is (A) 2X pm Solution: In the fcc unit cell of NaCl, along a given edge,... View Article

Which of the following is a non-stoichiometric defect?

(A) Frenkel defect (B) Schottky defect (C) Interstitial defect (D) Metal deficiency defect The Correct Answer is (D) Metal deficiency defect.... View Article

Let r be the relation on z defined by R = {( a , b ): a , b ∈ Z , a – b is an integer}. Find the domain and range of R.

Given, r is the relation on Z defined by:... View Article

Which of the following equations have a unique solution or infinitely many solutions. (i) x−3y−3=0;3x−9y−2=0 (ii) 2x+y=5;3x+2y=8

In the following equations we need to find which one have a unique solution or infinitely many solutions. (i) x−3y−3=0;... View Article

Without solving, examine the nature of the roots of the equations 2x² – 6x + 3 = 0.

We need to examine the nature of the roots of the equations 2x² - 6x + 3 = 0. This can be done by finding the discriminant of the... View Article

One card is drawn from a well shuffled deck of 52 cards. The probability of getting a jack of red colour is:

One card is drawn from a well shuffled deck of 52 cards. The probability of getting a jack of red colour is 1/26. Explanation: Total number... View Article

Derive an expression for torque in terms of the moment of inertia.

Solution: Consider a rigid body rotating about a given axis with a uniform angular acceleration α, under the action of torque. Let the body... View Article

A photodiode is operated in the reverse bias. Why?

a) Photocurrent flows only in the reverse direction b) Thermally generated current is large in reverse bias as compared to the photocurrent... View Article

For a body in a circular motion with a constant angular velocity, the magnitude of the average acceleration over a period of half a revolution is…… times the magnitude of its instantaneous acceleration

a) 2/π b) π/2 c) π d) 2 Answer: a) 2/π Solution: Average acceleration, aavg = ΔV/ Δt =... View Article

A cat runs along a straight line with a constant velocity of magnitude v. A dog chases the cat such that the velocity of the dog is always directed towards the cat. The speed of a dog is u and always constant. At the instant, both are separated by distance x and their velocities are mutually perpendicular, the magnitude of the acceleration of the dog is.

a) u2/x b) uv/x c) v2/x d) (u2 + v2)/x Answer: b) uv/x Solution: The velocity of cat = v Speed of dog = u Let the velocity of the dog... View Article

In a magnetic field of 0.05T, the area of a coil changes from 101cm² to 100cm² without changing the resistance which is 2 Ω. The amount of charge that flow during this period is

a) 2.5 x 10-6 C b) 2 x 10-6 C c) 10-6 C d) 8 x 10-6 C Answer: a) 2.5 x 10-6 C Solution: Magnetic flux, Φ... View Article

The acceleration of a body moving with initial velocity u changes with distance x as a =k² √x where K is a positive constant. The distance travelled by the body when its velocity becomes 2u is

a) (3u/2k)3/4 b) (3u/2k)4/3 c) (3u/2k)3/2 d) (3u/2k)2/3 Answer: (3u/2k)4/3 Solution: Given, a... View Article

Find the equivalent thermal conductivity of the given rod

a) 2k/3 b) 3k c) 3k/2 d) 4k/3 Answer: d) 4k/3 Solution: Let A = Area T1 is the temperature of the sink T2 is the temperature of the... View Article

A current of 50 A is passed through a straight wire of length 6 cm, then the magnetic induction at a point 5 cm from either end of the wire is (1 gauss =10⁻⁴T)

a) 2.5 gauss b) 1.25 gauss c) 1.2 gauss d) 3.0 gauss Answer: c) 1.5 gauss Solution: B = (μ0I/4πr)[sinθ1 + sinθ2] = 10-7 x (50/(4 x... View Article

Two charged spherical conductors of radii R₁ and R₂ are connected by a wire. The ratio of surface charge densities of the sphere σ₁/σ₂ will be

a) R1/R2 b) R2/R1 c) √(R1/R2) d) R12/R22 Answer: b) R2/R1 The potential will be equal as they are connected with wire V1 =... View Article

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