Archives

On Richter scale, increase in magnitude of say 4 units mean that the destructive power of the earthquake increases by 4 times.

Richter scale is not linear. In fact, an increase of 2 in magnitude means 1000 times more destructive energy. For example, an earthquake of... View Article

A puppy was trapped by a current carrying wire and was barking for help, a little boy can’t stop himself and rushed for help and tried to save the dog by his naked hands but was caught himself. A man passing nearby took a wooden stick and saved both of them. Why did he use a wooden stick?

Wood is a poor conductor of electricity. It does not allow electric current to flow through it easily and is a poor conductor of electricity. But... View Article

For making a strong electromagnet, the material of the core should be

The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when current is flowing through the coil.... View Article

On which of the following surfaces would a toy car travel the farthest distance when a kid pushes it?

Among the above options, wet marble floor will have the least friction due to poor inter-locking between the surfaces. Hence, the toy car would... View Article

Electricity can be used for

Following are the uses of electricity: Use of electricity in healthcare: Most of the medical equipment runs on electricity such as X-ray... View Article

The objects which do not allow electric current to flow through them easily are known as

The objects which do not allow electric current to flow through them easily are known as poor conductors of electricity.... View Article

Hope you payed attention to the question! Now tell us in which of these cases will current flow in the circuit?

Keep watching to know!... View Article

Which of the following object cannot produce electric current in a conductor?

None of the the mentioned objects can produce an electric current. The ear phone connected to the cell phone works only when current flows... View Article

What is an electric cell?

Answer: An electric cell is a device, which converts chemical energy into electrical energy. It has two terminals, which are made up of... View Article

A damaged ear drum can cause

Since ear drum is a stretched membrane which receives sound and then transmits it to inner ear which transfer signals to brain and we hear. So,... View Article

Choose the correct option: begin{array}{|c|c|}

hline 1. & Tone & i. & frequenciesspace that space are space integral space multiple space of space fundamental space frequency. hline 2. & Note... View Article

Statement 1 : Sound vibrations make the ear drum vibrate, the ear drum sends vibration to inner ear, From there the signal goes to brain. Statement 2 : Ear drum is a thin stretched membrane.

The outer part of ear is like a funnel, Sound enters and it travels down a canal and then strikes a tightly stretched membrane known as ear drum.... View Article

There are 3 friends A, B & C. A is planning to deceive B by imitating the voice of C, but B catches A in his mischief. What factor/factors make(s) the sounds different?

Amplitude and frequency are two important properties of sound, which enable us to identify or recognize sounds. ... View Article

If an object oscillates 40 times in one second. Then frequency is:

Since, frequency is defined as the number of oscillations per second. So, here it is given that the body oscillates 40 times in one second,... View Article

When we crack a whip, a loud noise is created. Why?

When we crack a whip, speed of the tip is greater than that of sound. If the speed of a source is greater than that of sound, it is said to be... View Article

Dispersive power depends upon

Dispersive power depends upon the nature of the material. Dispersive power of prism is defined as the measure of the difference in refraction... View Article

Which of the following correctly represents the increasing order of frequency for infrasound, ultrasound and audible range?

Infrasound - Less than 20HzAudible Range - 20Hz to 20KHz Ultrasound - Greater than 20Khz... View Article

A converging lens is used to form an image on a screen. When upper half of the lens is covered by an opaque screen [IIT-JEE 1986; SCRA 1994; MP PET 1996; MP PMT 2004; BHU 1998, 05]

Because to form the complete image only two rays are to be passed through the lens and moreover, since the total amount of light released by the... View Article

Which of the following correctly represents the increasing order of frequency ?

Infrasound - Less than 20Hz,Audible Range - 20Hz to 20KHz, Ultrasound - Greater than 20Khz... View Article

Choose the correct option Statement 1: Sound cannot travel in vacuum. Statement 2 :Sound is a mechanical wave and propagates as an oscillation of particles through the medium. So they cannot travel in vacuum.

Sound waves propagate through to and fro motion of particles of the medium. Since there are no particles in vacuum, So sound waves cannot travel... View Article

M	T	W	T	F	S	S
				1	2	3
4	5	6	7	8	9	10
11	12	13	14	15	16	17
18	19	20	21	22	23	24
25	26	27	28	29	30