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A conducting sphere of radius r = 20 cm is given a charge q = 16μC. What is electric field E at its centre?

Answer: Given parameters Radius of the sphere (r) = 20cm = 0.2 m Charge (q) = 16μC = 16 × 10-6 C E = ? Electric field can be... View Article

A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body? (1) Radiation (2) Convection (3) Conduction (4) Temperature remains unchanged.

Answer: (3) Radiation In the radiation mode, heat can pass through a vacuum, reducing the temperature of the hot body. The physical act of... View Article

What happens to the centripetal acceleration of a revolving body if you double the orbital speed v and half angular velocity ω (1) It remains unchanged (2) It is halved (3) It is doubled (4) It is quadrupled

Answer: (1) It remains unchanged Centripetal acceleration is defined as the property of the motion of an object, traversing a circular path. Any... View Article

In the adjoining figure, AOB is a straight line. Find the value of x. Hence, find ∠AOC, ∠COD and ∠BOD

From the figure we know that ∠BOD and ∠AOD are a linear pair of angles Hence ∠BOD + ∠AOD = 180º It can also be... View Article

In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is

In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is zero In the... View Article

Moment of inertia of a rectangular plate about an axis passing through p and perpendicular to the plate is

Moment of inertia is defined as the quantity expressed by the body resisting angular acceleration which is the sum of the product of the mass of... View Article

How to find to find the mean, mode, and median of any set of numbers.

Mean is the most commonly used measure of central tendency. It actually represents the average of the given collection of data. It is applicable... View Article

Let us consider a system of units in which mass and angular momentum are dimensionless. If length has dimension of L, which of the following statement(s) is/are correct? (A) The dimension of force is L^–3 (B) The dimension of power is L^–5 (C) The dimension of linear momentum is L^–1 (D) The dimension of energy is L^–2

The correct options are (A) The dimension of force is L–3 (C) The dimension of linear momentum is L–1 (D) The dimension of... View Article

Assuming the balls to be identical except for difference in colours the number of ways in which one or more balls can be selected from 10 white, 9 green and 7 black balls is

Permutation relates to the act of arranging all the members of a set into some sequence or order. The combination is a way of selecting... View Article

A card is drawn from a well shuffled deck of 52 cards. what is the probability of getting a red queen card

Probability is the measurement of chances – the likelihood that an event will occur. If the probability of an event is high, it is more... View Article

The coefficient of friction of a surface is 1/√3. what should be the angle of inclination so that a body placed on the surface just begins to slide down?

The coefficient of friction is defined as the ratio of the force of friction acting between two objects and the force which is pushing them... View Article

If two interior angles on the same sides of a transversal intersecting two parallel lines are in the ratio 2 3 ,then the smaller of the two angles is

The angles which are formed inside the two parallel lines, when intersected by a transversal, are equal to its alternate pairs. These... View Article

An electron is travelling horizontally towards the east. A magnetic field in a vertically downward direction exerts a force on the electron along____ (a) East (b) West (c) North (d) South

The correct answer is (d) South The force experienced will be in the south direction. Fleming's left-hand rule is used to... View Article

A spring is kept compressed by a toy car of mass 150g. On releasing the car, it moves with a speed of 0.2ms−1. So, the elastic potential energy of the spring is

Given According to the given data m=150g=150×10−3kg v=0.2ms−1 Find out We have to determine the elastic... View Article

When a transversal intersects two parallel lines, the corresponding angles so formed will be ________

When a transversal intersects two parallel lines, the corresponding angles so formed will be equal Corresponding angles are the angles... View Article

Let a, b, c, d and p be any non zero distinct real numbers such that (a²+b²+c²)p²-2(ab+bc+cd)p +(b² +c²+d²) = 0. Then
1) a, c, p are in G.P. 2) a, b, c, d are in G.P. 3) a, b, c, d are in A.P. 4) a, c, p are in A.P.

The correct answer is 2) a, b, c, d are in G.P. Let us solve the given equation (a2+b2+c2)p2-2(ab+bc+cd)p +(b2 +c2+d2) = 0... View Article

Find the value of cos 360 degrees

Let us evaluate the cos 360 degrees value. As we know, cos 0° = 1 we can identify the value of cos 360° in unit circle as given... View Article

The HCF of 2472 and 1284 and a third number ‘n’ is 12. If their LCM is 2³×3²×5×103×107. Find the number ‘n’.

Answer: The Least Common Multiple (LCM) is a way of finding the smallest common multiple between any two numbers or more. A common multiple is a... View Article

Flux;ϕ(in webers) in a closed circuit of resistance 10 ohm varies with time t (in seconds) according to the equation ϕ=6t²−5t+1. What is the magnitude of the induced current in 0.25 seconds

Magnetic flux is defined as the number of magnetic field lines passing through a given closed surface. It provides the measurement of the total... View Article

An object is approaching a thin convex lens of focal length 0.3m with a speed of 0.01m/s.The magnitude of the rate of change of position of image when the object is at a distance of 0.4m from the lens is

A convex mirror is a type of spherical mirror in which the reflecting surface is the bulged out portion of the sphere, i.e. in this type of... View Article

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