Archives

How Many P-S And P-P Bonds Are Present In P4S3?

Phosphorus sesquisulfide (P4S3) has 6 P-S bonds and 3 P−P bonds. Explore more such questions and answers at BYJU’S.... View Article

The Density Of Copper Is 9 * 103 Kgm-3 And Its Atomic Mass Is 63.5u. Each Copper Atom Provides One Free Electron. Estimate The Number Of Free Electrons Per Cubic Meter In Copper.

Density = In moles Number of Cu atoms = Each copper atom provides one free electron. Therefore, the number of free electrons =... View Article

One Mole Of N2H4 Loses 10 Moles Of Electrons To Form A New Compound A. Assuming That All The Nitrogen Appears In The New Compound. What Is The Oxidation State Of Nitrogen In A?

Hydrazine is also called Diamine or Diazane or Nitrogen hydride and is a strong base. It is an azane and dangerously unstable. Each subunit of... View Article

Which Of The Following Pair Is C2 Epimer. (A)D-Glucose, D-Arabinose.(B)D-Glucose, D-Maltose.(C)D-Allose, D-Ribose. (D)D-Glucose, D-Mannose.

The correct answer is (A)D-Glucose, D-Arabinose. Explore more such questions and answers at BYJU’S.... View Article

Determine The Equivalent Weight Of The Following Salt NaCl.

The molecular weight of sodium chloride (NaCl) is Na = 1 * 22.989u = 22 Cl = 1 * 35.453u = 35 NaCl = 22 + 35 = 58.44 g/mol The valence of... View Article

Progestasert And LNG20 Are (A) Non-medical IUDs.(B) Copper Releasing IUDs. (C) Hormone Releasing IUDs. (D) None Of These

The correct answer is (C) Hormone Releasing IUDs. LNG -20 and Progestasert are both a kind of hormone-releasing IUD, which releases a hormone... View Article

Pure Substances Are Characterised By__________.(A) Variable Properties.(B) Fixed Boiling Points.(C) Variable Melting Points.(D) Non-uniform Composition.

The correct answer is (B) Fixed Boiling Points. The characteristic of a pure substance is that it has a fixed physical and chemical properties,... View Article

Define Rational Numbers With Examples.

A number, which is in the form of p/q, where q is not equal to 0, p and q are integers, is defined as a rational number. A rational number... View Article

The French East India Company Established Its First Factory In India At _____.

The answer is Surat. In 1668, the French East India Company established its first factory in India at Surat. Explore more such questions and... View Article

Discuss Briefly The Role Of Microbes In Household Products

Role of Microbes in Household Products: Bacteria in association with yeasts are known for the fermentation or souring of Dosa and Idli batter.... View Article

02 Sep 2021: PIB Summary & Analysis

TABLE OF CONTENTS 1. UK-India Economic and Financial Dialogue 2. Meeting of BRICS Ministers of Energy 3. World Coconut Day 4. Blue straggler... View Article

Starting from rest, the time taken by a body sliding down on a rough inclined plane at 45⁰ with the horizontal is twice the time taken to travel on a smooth plane of same inclination and same distance. Then, the coefficient of kinetic friction is

1) 0.25 2) 0.33 3) 0.50 4) 0.75 Answer: 4) 0.75 Solution: Coefficient of kinetic friction, μ = tanθ[1 - 1/n2]... View Article

A box of mass 2 kg is placed on the roof of a car. The box would remain stationary until the car attains a maximum acceleration. The coefficient of static friction between the box and the roof of the car is 0.2 and g =10 ms^-2. The maximum acceleration of the car, for the box to remain stationary, is

1) 8 ms-2 2) 6 ms-2 3) 4 ms-2 4) 2 ms-2 Answer: 4) 2 ms-2 Solution: ma = μmg a = μg = 0.2 x 10 = 2 m/s2... View Article

An object is gently placed on a long converges belt moving with 11 ms-1. If the coefficient of friction is 0.4, then the block will slide in the belt up to a distance of

1) 10.21 m 2) 15.125 m 3) 20.3 m 4) 25.6 m Answer: 2) 15.125 m Solution: a = mg = 0.4 x 10 = 4m/s2 u = 11m/s v = 0 v2 = u2 + 2as 0... View Article

Impulse is

1) a scalar 2) equal to change in the momentum of a body 3) equal to rate of change of momentum of a body 4) a force Answer: 2) equal to... View Article

A block of mass 2 kg is at rest on a floor. The coefficient of static friction between block and the floor is 0.54. A horizontal force of 2.8 N is applied to the block. What should be the frictional force between the block and the floor? (take, g =10 m/s²)

1) 8.8 N 2) 5.8 N 3) 2.8 N 4) 10.8 N Answer: 3) 2.8 N Solution: mass of block = 2kg coefficient of static friction = 0.4 Force... View Article

10000 small balls, each weighing lg, strike one square centimetre of area per second with a velocity 100 ms^-1 in a normal direction and rebound with the same velocity. The value of pressure on the surface will be

1) 2 × 103 Nm-2 2) 2 × 105 Nm-2 3) 107 Nm-2 4) 2 × 107 Nm-2 Answer: 4) 2 × 107 Nm-2 Solution: Pressure =... View Article

Two masses of M and 4M are moving with equal kinetic energy. The ratio of their linear momenta is

1) 1 : 8 2) 1 : 4 3) 1 : 2 4) 4 : 1 Answer: 3) 1 : 2 Solution: Relation between linear momentum and kinetic energy p... View Article

A bullet of mass 10 g moving with 300 m/s hits a block of ice of mass 5 kg and drops dead. The velocity of ice is

1) 50 cm/s 2) 60 cm/s 3) 40 cm/s 4) 200 cm/s Answer: 2) 60 cm/s Solution: Applying law of conservation of linear momentum... View Article

A rocket of mass 100 kg burns 0.1 kg of fuel per second. If velocity of exhaust gas is 1 kms^-1 , then it lifts with an acceleration of

1) 1000 ms-2 2) 100 ms-2 3) 10 ms-2 4) 1 ms-2 Answer: 4) 1 ms-2 Solution: Mass (m) = 100 Kg Velocity= 1 km/sec = 1000 m/s dm/dt = 0.1 Thrust... View Article

M	T	W	T	F	S	S
		1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30