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The phenomenon of electromagnetic induction is A) the process of charging a body B) the process of generating magnetic field due to a current passing through a coil C) producing induced current in a coil due to relative motion between a magnet and the coil D) the process of rotating a coil of an electric motor

(C) producing induced current in a coil due to relative motion between a magnet and the coil Explanation When a... View Article

Complete the world puzzle. Down: 1. Species on the verge of extinction. 2. A book carrying information about endangered species. 5. Consequence of deforestation. Across: 1. Species which have vanished. 3. Species found only in a particular habitat. 4. Variety of plants, animals and microorganisms found in an area.

Down 1. ENDANGERED 2. RED DATA BOOK 5. DESERTS Across 1. EXTINCT 3. ENDEMIC 4. BIODIVERSITY

State the rule to determine the direction of a (i) magnetic field produced around a straight conductor-carrying current, (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and (iii) current induced in a coil due to its rotation in a magnetic field.

(i) Maxwell’s right-hand thumb rule: Magnetic field produced around a straight conductor carrying current. The Maxwell right-hand thumb rule indicates the direction... View Article

An object of mass 1 kg travelling in a straight line with a velocity of 10 m/s collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.

Given m = 1kg, u1=10ms−1 M=5 kg and u2= 0ms−1 Find out The total momentum just before the impact and... View Article

Which statement about Krebs cycle is correct? i) The waste product of the Krebs cycle is oxygen ii) Complete oxidation of food takes place.Krebs cycle involves step by step breakdown of pyruvic acid/lactic acid to produce ATP and CO2. iii) Electron carriers are produced by the Krebs cycle for the transportation of electron chain. iv) None of the above

Complete oxidation of food takes place. Krebs cycle involves step by step breakdown of pyruvic acid/lactic acid to produce ATP... View Article

Adjacent figure is a vertical number line, representing integers. Observe it and locate the following points: (a) If point D is +8 then which point is -8? (b) Is point G negative integer or a positive integer? (c) Write integers for points B and E. (d) Which Point marked on this number line has the least value? (e) Arrange all the points in decreasing order of values.

(a) F (b) Negative (c) B=(+) 4; E = (-) 10 (d) E (e) D,C,B,A,O,H,G,F,E

A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because (a) the batsman did not hit the ball hard enough. (b) velocity is proportional to the force exerted on the ball. (c) there is a force on the ball opposing the motion. (d) there is no unbalanced force on the ball, so the ball would want to come to rest.

Option (C) is the right answer. The ball slows down and comes to rest due to opposing forces of air... View Article

Consider the following figure of line MN. Say whether the following statements are true or false in the context of the given figure: (a) Q, M, O, N, P are points on the line . (b) M, O, N are points on a line segment . (c) M and N are end points of a line segment . (d) O and N are end points of the line segment . (e) M is one of the end points of a line segment . (f) M is the point on ray OP. (g) Ray OP is different from ray OP. (h) Ray OP same as ray OM. (i) Ray OM is not opposite to ray OP. (j) O is not an initial point of NP and NM. (k) N is the initial point of NP and NM.

(a) The given statement is True (b)The given statement is True (c)The given statement is True (d) The given statement... View Article

Following is the list of temperatures of five places in India, on a particular day of the year. Place Temperature i) Siachin 10°C below 0 Degree C ii) Shimla 2°C below 0Degree C iii) Ahmedabad 30°C above 0 Degree C iv) Delhi 20°C above 0 Degree C v) Srinagar 5°C below 0Degree C (a) Write the temperature of these places in the form of integers in the blank column. (b) Following is the number line representing the temperature in degree Celsius. Plot the name of the city against its temperature. (c) Which is the coolest place? (d) Write the names of the place where temperature are above 10°C.

(a) Siachin→ -10°C Shimla→ -2°C Ahmedabad→ 30°C Delhi→ 20°C Srinagar→ -5°C (b) (c) The coolest place is where the temperature... View Article

Write the difference between Eukaryotes and Prokaryotes

Cells fall into one of two broad categories: prokaryotic and eukaryotic. Here are some differences between them listed below. Prokaryotes Eukaryotes Most prokaryotes... View Article

Why is Bithional added to soaps?

Bithional added to soaps to impart antiseptic properties and to reduce the odour produced by bacterial decomposition of organic matter... View Article

Why asexual reproduction is good?

An advantage of asexual reproduction is that it is speedy and develops multiple offspring in very little time. Asexual reproduction... View Article

Why Aniline is insoluble in water?

Aniline is insoluble in water because of the large hydrocarbon part that retards the formation of an H-bond. So it... View Article

When does a body floats in a liquid and why?

A body floats in a liquid when the body’s weight is equal to the weight of the liquid displaced. The... View Article

Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium

We know that : v = λ × n Here, the Speed of the wave, v = 440 m/s Frequency, n =... View Article

What is the power generated in a windmill?

The power generated in a windmill depends on the speed with which the blades of the windmill are rotating, which... View Article

Calculate the number of aluminium ions present in 0.051 g of aluminium oxide.(Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of Al = 27 u) .

1 mole of aluminium oxide (Al2O3) = 2 × 27 + 3 × 16 = 102g i.e., 102g of Al2O3... View Article

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