Latest Posts

Calculate The Uncertainty In The Velocity Of A Wagon Of Mass 3000 Kg. Whose Position Is Known To An Accuracy Of 10pm.

Sol: By Heisenberg’s Uncertainty Principle, \(\begin{array}{l}\Delta n.m\Delta v \geq \frac{h}{4x}\\\Rightarrow \Delta v = \frac{h}{4\Pi m\Delta x}\\\Rightarrow 1.75 * 10^{-27} m/s.\end{array}... View Article

The Most Populous Union Territory In India, According To The 2011 Census, Is _____. (A) Delhi. (B) Ladakh. (C) Chandigarh. (D)Andaman and Nicobar Islands.

The correct answer is (A) Delhi. Delhi is the largest union territory in India in terms of population. Explore more... View Article

The Saturation Point Of CO2 In C4 Plants Is (A) 360 μl/L.(B) 390 μl/L. (C) 450 μl/L. (D) 460 μl/L

The correct answer is (A) 360 μl/L. The optimum CO2 concentration in C4 plants is 360 μl/L or 360 ppm.... View Article

Solve: (x+2) (x+3) + (x−3) (x−2) − 2x (x+1) = 0

Sol: Given: (x+2) (x+3) + (x−3) (x−2) − 2x (x+1) = 0 ⇒ x2 + 2x + 3x + 6... View Article

How Does Oscillating Charge Produce Electromagnetic Waves?

An oscillating charge produces an oscillating electric field in space, which produces an oscillating magnetic field. The oscillating electric and... View Article

The Number 31,13,11,31,13,11,31,13,11,311 Is Divisible By both 3 And 11. (True / False)

The given statement is false. The number 31,13,11,31,13,11,31,13,11,311 is neither divisible by 3 nor by 11. According to the rules... View Article

Find The Smallest Number By Which 3645 Must Be Divided So That It Becomes Perfect Square. Also, Find The Square Root Of The Resulting Number.

Sol: 3645 = (3 * 3) * (3 * 3) * 5 * 3 ⇒ 32 * 32 * 5 *... View Article

The Selling Price Of A Sofa-Set Is 3/5 Times Of Its Cost Price. Find The Gain Or The Loss As Percent.

Sol: Let the cost price (CP) be x Let the selling price (SP) be \(\begin{array}{l}\frac{3}{5} x\end{array} \) Loss = CP... View Article

A Solution Is Obtained Bby Mixing 300 G Of 25 Percent Solution And 400 G Of 40 Percent Solution By Mass. Calculate The Mass Percentage Of The Resulting Solution.

The total amount of solute present in the solution is ⇒ \(\begin{array}{l}\frac{300 * 25}{100} + \frac{400 * 40}{100}\end{array} \) ⇒... View Article

A Given Sample Of Drinking Water Was Found To Be Severely Contaminated With Chloroform (CHCl3) Supposed To Be A Carcinogen. The Level Of Contamination Was 15 Ppm By Mass. Answer The Following Questions.

(I) Express This In Percent By Mass. The amount of chloroform (CHCl3) is 15 ppm. The precent by mass is\(\begin{array}{l}... View Article

State The Function Of Decomposers In An Ecosystem

Decomposers are micro-organisms that digest things that are dead or decaying and turn the dead plants and animals into humus.... View Article

What Is The Purpose Of Contra Entry

The entries which take place between bank and cash are termed as contra entries. In contra entries, the deposited cash... View Article

Term Biology Was Introduced By (A) Darwin.(B) Linnaeus. (C) Aristotle. (D) Lamarck and Treviranus.

The correct answer is (D) Lamarck and Treviranus. Biology is the branch of science which deals with the study of... View Article

Not For Profit Concerns Do Not Have A Profit Motive (True / False)

The given statement is true. The Not-for-Profit is an Organisations that work with its main motive to provide service. These... View Article

Write Down A Unit Vector In XY-Plane, Making An Angle Of 30degree With The Positive Direction Of X-Axis.

Sol: If vec{r} is a unit vector in the XY-plane, then \(\begin{array}{l}\vec{r} = cos\Theta \hat{i} + sin\Theta \hat{j}\end{array} \) Here,... View Article

A Sample Of Radioactive Material Has Mass ‘m’, Decay Constant Λ And Molecular Mass ‘m’. If Na is Avogadro’s Number, What Will Be The Initial Activity Of The Sample?

Sol: We know that the activity of any radioactive material is λN, where: N is the number of undecayed nuclei... View Article

A Ladder Rests Against Frictionless Vertical Wall, With Its Upper End 6 M Above The Ground And The Lower End 4 M Away From The Wall. The Weight Of The Ladder Is 500 N And Its Centre Of Gravity At (1/3) Rd Distance From The Lower End. What Will Be The Wall’s Reaction?

Sol: N1 = Normal force from the wall to the ladder. N2 = Normal force from the ground to the... View Article

«
1
…
1,022
1,023
1,024
1,025
1,026
…
5,472
»