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An electric kettle has two coils when one of these is switched on the water in the kettle boils in 6 min. When the other coil is switched on, the water boils in 3 min. If the two coils are connected in series, the time taken to boil the water in the kettle is

Sol: From Joule’s Law of heating: \(\begin{array}{l} \Rightarrow Q = \frac{E^{2}}{R_{1}} * 6 —-[1] \end{array} \) \(\begin{array}{l} \Rightarrow Q =... View Article

How Many Isomers Are Possible In C4H8? (A)5 (B)4 (C)3 (D)2

The correct answer is (A) 5 There are five isomers with the formula C4H8 But-1-ene or 1-butylene But-2-ene Cyclobutane 2-Methylpropane... View Article

Two Cars Are Moving In The Same Direction With The Same Speed Of 30Km/Hr. They Are Separated By 5Km. What Is The Speed Of A Car Moving In The Opposite Direction If It Meets The Two Cars At An Interval Of 4 Minute

As given in the question: Two cars are moving in the same direction with the same speed be – A... View Article

What Is Bad Ozone And Good Ozone?

When present on the Earth’s surface, ozone is a very poisonous gas. Hence it is called bad ozone. When present... View Article

A shopkeeper sells a saree at 8% profit and a sweater at a 10% discount, thereby, getting a sum of Rs. 1008. If she had sold the saree at 10% profit and the sweater at an 8% discount, she would have got Rs.1028. Find the cost price of the saree?

Sol: Let Cost Price (CP) of saree Rs x Let Cost Price (CP) of sweater Rs y According to the... View Article

Distinguish Between Biodegradable And Non-biodegradable Substances.

The difference between biodegradable and non-biodegradable substances Biodegradable Substances Non-biodegradable Substances They are considered safe for the environment They are... View Article

The magnifying power of a compound microscope increases when A) The focal length of the objective lens is increased and that of the eyepiece is decreased. B) The focal length of the eyepiece is increased and that of the objective lens is decreased. C) Focal lengths of both objective and eyepiece are increased. D) Focal length of both objective and eyepiece are decreased.

The correct answer is (D). Focal Length Of Both Objective And Eyepiece Are Decreased. The magnifying power of a compound-... View Article

Which Of The Following Is An Economic Activity (A)To Teach Son At Home (B) To Play Football By A Student(C)To Serve Her Child By Mother (D)Teaching Of A Teacher In The School

The correct answer is (D)Teaching Of A Teacher In The School. Economic activities are concerned with money or wealth Economic... View Article

What Is Geminal Dihalide

An organic compound containing two halide groups attached to the same carbon atom is called Geminal dihalide. The common name... View Article

Y Log X Is A Solution Of (A) xy2 = y1 (B) xy2 + y = 0 (C) xy1 + y2 = 0 (D) xy2 + y1 = 0

The correct answer is (D) \(\begin{array}{l} xy_{2} + y_{1} = 0 \end{array} \) y = logx \(\begin{array}{l} \Rightarrow y_{1} =... View Article

Shareholder wealth in a firm is represented by___________. A.) the number of people employed in the firm B) the book value of the firm’s assets less the book value of its liabilities C) the amount of salary paid to its employees D) the market price per share of the firms common stock

The correct answer is (D) The Market Price Per Share Of The Firm Common Stock. Explore more such questions and... View Article

Bernoulli’s Principle Is Based On The Law Of Conservation Of (A)Mass (B)Energy (C)Momentum (D)All Of These

The correct answer is (B)Energy. Bernoulli’s principle is based on the principle of conservation of energy. Explore more such questions... View Article

What Is Soil Formation Called

The process of soil formation is called Pedogenesis. Pedogenesis is influenced by organisms present in the soil, climatic conditions, weathering... View Article

For An Ideal Fluid, Viscosity Is (A)Unity (B)Zero(C)Infinity (D)Finite But Small

The correct answer is (B) Zero. Ideal fluid has zero viscosity. This is because an ideal fluid has no resistance... View Article

Which Of The Following Is Not A Storage Medium (A) DVD (B)Scanner (C)Flash Drive (D)Hard Disk

The correct answer is (B)Scanner. The scanner is a device that optically scans images and other documents. It is not... View Article

The Most Important Reason For The Decrease In Biodiversity Is (A) Over-exploitation (B) Habitat Pollution (C) Habitat Destruction (D)Introduction Of Exotic Species

The correct answer is (C) Habitat Destruction. The most important reason for the decrease in Biodiversity is habitat destruction. Habitat... View Article

Which one of the following is not correctly matched (A)Freedom of speech and expression – Include freedom of press (B) Right to Equality – Include principles of natural justice (C) Freedom of conscience – Include right to wear and carry kirpans by Sikhs (D) Right to Personal liberty – Include right to carry on any trade or business.

The correct answer is (D) Right To Life And Personal Liberty – Includes Right To Carry On Any Trade And... View Article

An Electric Motor Creates A Tension Of 4500 N In A Hoisting Cable And Reels It At A Rate Of 2 M/S. Calculate The Power Of The Motor.

Sol: Power = Force * Velocity \(\begin{array}{l} \Rightarrow 4500 × 2 \end{array} \) \(\begin{array}{l} \Rightarrow 9000 W \end{array} \) \(\begin{array}{l}... View Article

For the reaction 2N2 O 5 →4NO 2 +O 2 , If the initial concentration Of N2 O 5 Is 7.2Mol −1 And After 20 Minutes, [No 2 ] becomes 2.4 Mol −1, then what will be the rate of decomposition of N2 5 in Mol −1 Min −1?

Given reaction is \(\begin{array}{l} 2N_{2}O_{5} \right arrow 4NO_{2} + O_{2}\end{array} \) The concentration of \(\begin{array}{l}N_{2}O_{5}\end{array} \) is 7.2mol L^{-1} \end{array}... View Article

Photoelectric emission is observed from a metallic surface for frequencies v1 and v2 of the incident light rays (v1>v2) . If the maximum values of kinetic energy of the photo-electrons emitted in the two cases are in ratio of 1:k, then the threshold frequency of the metallic surface is:

Maximum Kinetic Energy- \(\begin{array}{l} K.E._{max} = hv – hv_{T} \end{array} \) \(\begin{array}{l} K.E._{max(1)} = hv_{1} – hv_{T}—[1] \end{array} \) \(\begin{array}{l}... View Article

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