50+ Physics Questions asked in RRB NTPC 2016 Exam: Download PDF

Here is the list of important topics for Physics section in RRB NTPC Exam:

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Read suggested: Coding Decoding Questions for RRB NTPC

Here is a sample of 50+ Physics Questions PDF

Q 1. The distance from Earth to the sun is measured in __________

Solution:

* The distance between Earth and Sun is measured in Astronomical Unit.

* An Astronomical unit is average distance between Earth and the Sun, which is about 93 million miles or 150 million kilometres.

* It is used to determine distance between space bodies and it also play vital role in definition of another unit of astronomical length, the Parsec.

* 1 Astronomical Unit = 4.8 millionths of a parsec = 15.8 millionths of a light year.

Q 2. What is mass per unit volume?

Solution:

* Mass per unit volume is known as Density.

* The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases.

* The reciprocal of the density of a substance is occasionally called its specific volume.

* Work is defined as energy transferred when a force moves an object through a distance.

* Power is defined as rate of doing work or the amount of energy transferred per unit time.

Q 3. Which type of waves is used to penetrate hard objects at hospitals and Airports

Solution:

* X rays are used to penetrate hard objects at hospitals and Airports.  

* X-rays are electromagnetic radiations having wavelength ranging from 0.01 to 10 nanometers. They are discovered by Wilhelm Rontgen in 1895.

*Hard X-rays can traverse relatively thick objects without being much absorbed or scattered due to their high penetration power.

*Hard X-rays are widely used to image the inside of objects, e.g, in medical radiography and airport security.

Q 4. Knife is an example for-

Solution:

* A wedge is a triangular tool. A knife can be a example of a wedge.  

*Wedge has wide applications such as to separate two objects or portions of an object, lift up an object, or hold an object in place.

*Axe is fine example of a wedge. Other examples of wedges are found in drill bits, which produce circular holes in solids.

*Dividing the height of the wedge by the wedge's width gives the mechanical advantage of a wedge.

Q 5. Freely suspended magnet always stays in the direction?

Solution:

• The freely magnet always stays in North South direction. The shape of the Earth's magnetic field resembles that of a bar magnet of length.
• The South Pole of the Earth's magnet is in the geographical North because it attracts the North Pole of the suspended magnet and vice versa.
• The axis of Earth's magnet or the magnetic pole and the geographical axis or geographical pole does no coincide.
• In other words a freely suspended magnet does not show exact geographical South and North it only shows magnetic north and south poles.

Q 6. Study the following statements and choose right option.

Solution:

* Reverberation Principle- A reverberation, or reverb, is created when a sound or signal is reflected causing numerous reflections to build up and then decay as the sound is absorbed by the surfaces of objects in the space.

*Doppler effect is an increase/decrease in the frequency of sound, light, or other waves as the source and observer move towards/away from each other. To know this, a star is coming to us or goes too far away is hence an example to be known by Doppler effect.

Q 7. The theory behind stars twinkling is that _______.

Solution:

• The refractive index of the different layers of earth’s atmosphere changes continuously, consequently the position of the star’s image changes with time.
• This is the theory behind the twinkling of stars.
• When starlight enters our atmosphere it is affected by winds in the atmosphere and by areas with different temperatures and densities. This causes the light from the star to twinkle when seen from the ground.

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