Test - Physics - 2

Test - Physics - 2

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20 Questions MCQ Test SSC CGL Tier 2 - Study Material, Online Tests, Previous Year | Test - Physics - 2

Test - Physics - 2 for Railways 2023 is part of SSC CGL Tier 2 - Study Material, Online Tests, Previous Year preparation. The Test - Physics - 2 questions and answers have been prepared according to the Railways exam syllabus.The Test - Physics - 2 MCQs are made for Railways 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test - Physics - 2 below.
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Test - Physics - 2 - Question 1

In the absence of ozone layer, Which rays will enter into atmosphere?

Detailed Solution for Test - Physics - 2 - Question 1

The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (O3). The ozone layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.

Test - Physics - 2 - Question 2

Light year is the unit of -

Detailed Solution for Test - Physics - 2 - Question 2

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.

Test - Physics - 2 - Question 3

An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's –​

Detailed Solution for Test - Physics - 2 - Question 3

Newton's first law of motion -sometimes referred to as the law of inertia-states that every object will remain at rest or in uniform  motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia.

Test - Physics - 2 - Question 4

Cathode rays when obstructed by metal cause emission of -

Test - Physics - 2 - Question 5

Sensation of sound persists in our brain for about -

Detailed Solution for Test - Physics - 2 - Question 5

The sensation of hearing of any sound persists in our brain for 0.1s.This is called the persistence of hearing.

Test - Physics - 2 - Question 6

Tape recorder should not be kept near one of the following things –

Detailed Solution for Test - Physics - 2 - Question 6

The cassette tape contains a magnetic strip wound around two spools. Tiny magnetic particles are randomly scattered throughout the tape. A tape recorder should not be kept near a magnet as the latter can cause the magnetic material to be pushed and pulled out of place. Rearranging the magnetic particles erases the sound.

Test - Physics - 2 - Question 7

Which physical quantity is measured in ‘siemens’?

Detailed Solution for Test - Physics - 2 - Question 7

The Siemens is the unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).

Test - Physics - 2 - Question 8

The surface tension of water on adding detergent to it –

Detailed Solution for Test - Physics - 2 - Question 8

In the solid and liquid phase, water molecules are bonded to each other by virtue of an interaction between hydrogen atoms on one molecule and the oxygen atom of another — the process is referred to as "hydrogen bonding." The result is a kind of "skin" on liquid water's surface.

Test - Physics - 2 - Question 9

In a refrigerator, the cooling system should always be –

Detailed Solution for Test - Physics - 2 - Question 9

The compressor is the motor (or engine) of the cooling system. It is normally at the bottom of the refrigerator in the back. The compressor runs whenever the refrigerator thermostat calls for cooling.

Test - Physics - 2 - Question 10

Which of the following is optical illusion?

Detailed Solution for Test - Physics - 2 - Question 10

A mirage is a naturally occurring optical illusion or phenomenon in which light rays are bent due to refraction in layers of air of varying density. The image usually is upside down, enhancing the illusion that the sky image seen in the distance is really a water or oil puddle acting as a mirror.

Test - Physics - 2 - Question 11

The base of an electric iron is brightly polished mainly -

Detailed Solution for Test - Physics - 2 - Question 11

Polished surfaces are poor radiators of heat. So loss of heat on that account is reduced and the electric iron remains hotter than otherwise.

Test - Physics - 2 - Question 12

If the length of a simple pendulum is halved then its period of oscillation is -

Test - Physics - 2 - Question 13

Lux is the SI unit of -

Detailed Solution for Test - Physics - 2 - Question 13

The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m2.

Test - Physics - 2 - Question 14

Eclipses occur due to which optical phenomena?

Detailed Solution for Test - Physics - 2 - Question 14

An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer. Rectilinear propagation is a wave property which states that waves propagate (move or spread out) in straight lines.

Test - Physics - 2 - Question 15

Pure water is bad conductor of electricity because it is –

Detailed Solution for Test - Physics - 2 - Question 15

Pure water is a covalent compound. It exists as simple discrete molecules and have a simple molecular structure. Hence, it does not exist as ions. Therefore, pure water cannot conduct electricity due to the absence of mobile ions and electrons. One instance that water can conduct electricity is when there are dissolved substance in it. Only then will water dissociate into hydrogen ions and hydroxide ions. The presence of mobile ions enables it to conduct electricity.

Test - Physics - 2 - Question 16

Pycnometer is an instrument used to measure the –

Detailed Solution for Test - Physics - 2 - Question 16

A gas pycnometer is a laboratory device used for measuring the density — or more accurately the volume — of solids, be they regularly shaped, porous or non-porous, monolithic, powdered, granular or in some way comminuted, employing some method of has displacement and the volume-pressure relationship known as Boyle's Law.

Test - Physics - 2 - Question 17

Lamberts law is related to –

Detailed Solution for Test - Physics - 2 - Question 17

Lambert's Law says that the intensity of emitted light from a surface is directly proportional to the cosine of the angle between the line of view and the normal to the surface. A Lambertian surface is a surface that follows this rule exactly. In practice, most surfaces are not perfectly Lambertian. A surface which obeys Lambert's law is said to be Lambertian, and exhibits Lambertian reflectance. Such a surface has the same radiance when viewed from any angle.

Test - Physics - 2 - Question 18

Rain drops acquire spherical shape due to -

Detailed Solution for Test - Physics - 2 - Question 18

The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.

Test - Physics - 2 - Question 19

The angular velocity depends upon the rate of change of the _______.

Detailed Solution for Test - Physics - 2 - Question 19
• Angular velocity is a vector amount portrayed as the progress of actual uprooting, which determines the  or rotational speed of an article and the pivot regarding which the item is turning.
• How much difference in precise molecule removal at a given timeframe is called Angular velocity. The track of the angular vector is vertical to the plane of a pivot, toward a path customarily demonstrated by the right-hand rule.
Test - Physics - 2 - Question 20

Coolis tube is used to produce –

Detailed Solution for Test - Physics - 2 - Question 20

X-rays are part of the electromagnetic spectrum, an ionizing radiation with wavelengths shorter than ultraviolet light. X-ray tubes evolved from experimental Crookes tubes with which X-rays were first discovered in the late 19th century, and the availability of this controllable source of X-rays created the field of radiography, the imaging of opaque objects with penetrating radiation.

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