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Two travelling waves produce a standing wave represented by equation y = 1.0mm cos(1.57cm⁻¹ x) sin(78.5s⁻¹) t, the node closest to the origin in the region x > 0 will be at x = _____cm.

Solution: Answer: 1 cmAt node y = 0⇒ 1 cos(1.57 x) sin (178.5)t = 0⇒ cos (1.57 x) = 0⇒ 1.57 x = π/2⇒ x = 1 cm... View Article

An amplitude modulated wave is represented by, C_m= 10(1 + 0.2sin12560t)sin(1.11 × 10⁴t) V the modulating frequency in kHz will be

Solution: Answer: 2 kHzAs we know that, ⇒ 2πfm = 12560fm = 2000 Hz = 2 kHz... View Article

Find the moment of inertia for a badminton racket about an axis passing through ‘A’ and perpendicular to the plane as shown in the figure. Mass of the circular portion is M and that of the straight is

a. Solution: Answer: (a)... View Article

Which of the following compounds are metamers?

Question: Which of the following compounds are metamers? Solution:Answer: (a)Metamerism is a type of structural isomerism that is seen in a... View Article

Product (P) is – Chemistry Problem

Question: Product (P) is: Solution:Answer: (b)The addition of HBr in the presence of peroxide takes place through the free radical addition... View Article

What is the major use of dihydrogen (H₂)?

a. Formation of HNO3b. Synthesis of ammonia (NH3)c. Fuel cell for generating electrical energyd. Reduction of heavy metal oxides to... View Article

Choose the correct structure of paracetamol.

Solution:Answer: (a)The correct structure of paracetamol isHence, the correct answer is option (a).... View Article

In an octahedral complex of Fe²⁺ in a high spin state, what is the magnetic moment (spin only)?

a. 4.89 BMb. 1.73 Bc. 0 BM d. 3.87 BMSolution:Answer: (a)Electronic configuration of 26Fe2+ is [Ar]3d64s0Since an octahedral complex in a high... View Article

Which among the following statements about enzymes is not correct?

a. Enzymes are non-specificb. Enzymes are temperature and pH specificc. Almost all enzymes are proteinsd. Enzymes act as a... View Article

Identify the process in the given reactions

Question: Identify the process in the given reactions a. A = roasting; B = calcination.b. A = calcination; B = roasting.c. A = B =... View Article

What is added with HNO_3 in the Carius method?

a. H2SO4b. AgNO3c. HNO3d. CaCO3Solution:Answer: (b)Carius method: A known mass of an organic compound is heated with fuming nitric acid in the... View Article

Cu²⁺ salts react with KI and form

a. Cu2I2b. CuIc. Cu(I3)2d. CuI3Solution:Answer: (a)2Cu2+ + 4KI → Cu2I2 (s) + I2But the complete reaction is:2CuSO4 (aq) + 4KI(aq) →... View Article

The below given first-order reaction has initial and final moles

Question: The below given first-order reaction has initial and final moles of PCl5 as 50 and 10 respectively in 120 minutes. Find the rate... View Article

An equimolar mixture of NaOH and Na₂CO₃ weighs 4 g, then the weight of NaOH is:

Solution:Answer: 1.096 gLet the weight of NaOH be w1 g and that of Na2CO3 be w2 gThe molar mass of NaOH is 40 g/molMolar mass of Na2CO3 is 106... View Article

The initial mass of a radioactive substance becomes 1/16th in 80 minutes. Find the half-life.

Answer: 20 min.[A]t = [A]o / 2n[A]t is the concentration at time t[A]o is the initial concentrationn is the number of half-livesGiven: 1 / 2n = 1... View Article

Bakelite is formed by cross-linking of which of the following

a. Novolacb. Buna-Sc. Dacrond. PHBVSolution:Answer: (a)Bakelite is formed by cross-linking of novolac and formaldehyde.Hence option (a) is the... View Article

In nitration HNO₃ and H₂SO₄ act as:

a. Both acidb. Both basec. HNO3: acid and H2SO4: based. HNO3: base and H2SO4: acidSolution:Answer: (d)Nitration using HNO3 and H2SO4 goes by an... View Article

The hybridization of N in [latex]NO_{2}^{-}[/latex], [latex]NO_{2}^{+}[/latex], [latex]NO_{4}^{+}[/latex] are respectively.

a. sp2, sp, sp3b. sp3, sp, sp3c. sp, sp, sp3d. sp2, sp2, sp3Solution:Answer: (a)To find the number of hybrid orbitals involved in hybridization,... View Article

Sodium does not normally react with

a. Ammonia gasb. Ethynec. But-2-yned. PropyneSolution:Answer: (c)For reaction with sodium metal, the compound should have acidic hydrogen. Ethyne... View Article

Predict the product – Chemistry Problem

Question: Predict the product. Solution:Answer: (c)This reaction is aldol condensation.Hence, option (c) is the correct answer.... View Article

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