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Which of the following has more inertia? A five-rupee coin or a one-rupee coin.

Inertia is a property of a body that causes it to prefer to be at rest or in motion. Let us now investigate the factor that causes inertia. As a... View Article

The frequency n of vibration of stretched string depends upon its length l, its mass per unit length m and Tension t in the string Obtain dimensionally an expression for frequency n.

Let the relation be: Frequency v = KLafbmc where k is a dimensionless constant The dimension of each quantity are: L=[M0L1To] f=[M1L1T−2]... View Article

Two forces, while acting on a particle in opposite; directions, have the resultant of 10N. If they act at right angles to each other, the resultant is found to be 50N. Find the two forces.

The resultant force is described as the total amount of force acting on the object or body along with the direction of the body. The resultant... View Article

What will happen to a compass needle when the compass is placed below a wire and a current is made to flow through the wire? Give a reason to justify your answer.

Assume we're holding a current-carrying straight conductor in our right hand, with the thumb pointing in the current's direction. The right-hand... View Article

An object is thrown vertically upwards to a height of 10 m. Calculate its (a) Velocity with which it was thrown upward. (b) Time taken by the object to reach the highest point.

We have given the maximum vertical height attained by the object is h=10m . (a)To calculate the initial velocity of the object with which it is... View Article

A circular loop of radius 0.0157 m carries a current of 2.0 amp.The magnetic field at the center of the loop is

The magnetic field due to a circular loop is given by: B = μ0/4π 2πi/r =10−7 × 2π×2/ 0.0157 = 8 ×... View Article

A compass needle just above a wire in which electrons are moving towards east, will point: A) east B) west C) north D) south

Step 1: First, we'll go through the fundamentals of how a magnet works. Simply said, two magnetic fields—the earth's field and the field... View Article

When 10¹⁹ electrons are removed from a neutral metal plate through some process, the charge on it becomes_____________

We are given a situation, we are removing 109 electrons from a neutral metal plate through some unknown process. We must determine the charge... View Article

Where should an object be placed from a converging lens of focal length 20 cm, so as to obtain a real image of magnification 2?

Given, focal length of a converging lens, f= +20cm, Magnification of image (real) = 2. We know, magnification, m= −v/u ∴... View Article

In a sonometer experiment, the string of length ‘L’ under tension vibrates in a second overtone between two bridges. Where is the amplitude of vibration is maximum at?

The supplied string is L in length and vibrates in the second overtone, therefore n=3, which means it will have two nodes and three antinodes.... View Article

At sunrise or at sunset the sun appears to be reddish while at midday it looks white. Explain.

The scattering of light by tiny particles with regard to the wavelength of the incident light is known as Rayleigh scattering. Light intensity is... View Article

A ball is dropped from the top of a tower of height 100m. Simultaneously, another ball was thrown upward from the bottom of the tower with a speed of 25m/s (g=10ms2 ). These two balls would cross each other after a time: A) 1 second B) 2 second C) 3 second D) 4 second

Here we can see a tower is there of 100m and a ball from 100m height is falling under gravity which is 10m/s2 and another ball is... View Article

If a ball is thrown vertically upwards with 40m/s its velocity after two seconds will be:-

The acceleration of the body will be due to the earth's gravitational force, therefore the acceleration will be –g (the negative sign indicates... View Article

The mass of the earth is 81 times the mass of the Moon and the distance between the earth and the Moon is 60 times the radius of earth. If R is the radius of the earth, then the distance between the Moon and the point on the line joining the Moon and the earth where the gravitational force becomes zero is

Consider that the moon's mass is M. As a result, the earth's mass is 81M. The radius of the earth is R once more. As a result, r=60R is the... View Article

A current flows in a conductor from east to west. The direction of the magnetic field at a point above the conductor is: A. towards east B. towards west C. towards north D. towards south

Answer: (c) Towards north The 3D orientation of the axis is represented by the right hand thumb rule. However, in our scenario, we have the... View Article

A circular coil carrying a current I has radius R and number of turns N . If all the three, i.e., the current I, radius R and number of turns N are doubled, then magnetic field at its centre becomes

When current I flows in a circular coil with radius R and number of turns N, we first apply the Biot-Savart law to calculate the relationship... View Article

A train of mass M is moving on a circular track of radius R with a constant speed v. The length of the train is half of the perimeter of the track. Find the linear momentum of the train.

Around the Y-axis, the train is symmetrical. A and B are two symmetrical positions on the Y-axis that correspond to two points in the train's... View Article

The gravitational force causes (A) Tides (B) None of them (C) Motion of moon (D) Both (a) and (c)

Answer: (D) Both (a) and (c) The moon travels in a round orbit around the earth. Despite the fact that the orbit is not round, it is... View Article

If energy(E), velocity (V) and force (F) be taken as fundamental quantity, then what are the dimension of mass ?

The quantities that are independent of other quantities are called fundamental quantities. The units that are used to measure these fundamental... View Article

Two rods Aand Bof different materials are welded together as shown in the figure. Their thermal conductivities are K1 and K2. What is the thermal conductivity of the composite rod?

In fact, it plays a critical part in conduction heat transfer, although we tend to address the conductivity mode of heat transfer without knowing... View Article

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