Explore topic-wise InterviewSolutions in Current Affairs.

Answer:

Polaroid sunglasses are familiar to most of us. They have a special ability to cut the glare of light reflected from water or glass (see Figure 1). Polaroids have this ability because of a wave CHARACTERISTIC of light called polarization. What is polarization? How is it produced? What are some of its uses? The answers to these questions are related to the wave character of light.

Two photographs side by side of the same calm stream bed. In photograph a, the reflections of the clouds and some blue sky prevent you from seeing the pebbles in the streambed. In photograph b, there is essentially no reflection of the sky from the water’s surface, and the pebbles underneath the water are clearly visible.

Figure 1. These two photographs of a river show the effect of a polarizing filter in reducing glare in light reflected from the surface of water. Part (b) of this Figure was taken with a polarizing filter and part (a) was not. As a RESULT, the reflection of clouds and sky observed in part (a) is not observed in part (b). Polarizing sunglasses are particularly useful on snow and water. (CREDIT: Amithshs, Wikimedia Commons)

The schematic shows an axis labeled c that points to the right. On this axis are two sinusoidal waves that are in phase. The wave labeled E oscillates up down in the vertical plane and the wave labeled B oscillates back and forth in the horizontal plane. At the tip of the axis c is a double HEADED arrow oriented vertically that is labeled direction of polarization.

Figure 2. An EM wave, such as light, is a transverse wave. The electric and magnetic fields are perpendicular to the direction of propagation.

However, a vertical slit blocks the horizontally polarized waves. For EM waves, the direction of the electric field is analogous to the disturbances on the ropes.

Answer:

Given,

2 heating coils of same length, l

Let resistance of thin WIRE be R

1

resistance of thick wire be R

2

We know,

for same MATERIAL, RESISTIVITY ρ is same

Cross section area of thin wire = A

1

Cross section area of thick wire = A

2

A

2

>A

1

R=

A

ρl

⟹Rα

A

1

⟹R

1

>R

2

(∵A

2)

>A

1)

Rate of HEAT generation, P=

R

V

2

Both are connected to the same source V

Pα

R

1

⟹P

2

>P

1

(∵R

1

>R

2)

A thick wire coil will produce heat at a rate of heat generation, P=

R

V

2

Both are connected to the same source V

Pα

R

1

P

1

= Rate of heat generation by thin wire

P

2

= Rate of heat generation by thick wire

R

1

>R

2

⟹P

2

>P

1

The thick wire coil will generate heat at a greater rate.

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Explanation:

54 kilometres per HOUR

=15 metres per SECOND

ANSWER:

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Explanation:

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Answer:

The BAND of SEVEN COLOURS is known as spectrum.

ANSWER:

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धातुएँ सुरीली ध्वनि उत्पन्न करते हैं या जब इस पर प्रहार किया जाता है तो इससे घंटी जैसी आवाज आती है। प्रत्येक धातु के परमाणु के बाह्य शेल में 1से 3 इलेक्ट्रॉन होते हैं। इसमें आसानी से जंग लगता है (उदाहरण ऑक्सीकरण द्वारा नुकसान होता है जैसे कि धब्बा या जंग)। आसानी से इलेक्ट्रॉन खोता है।

Answer:

THE TEMPERATURE NEAR SEA REMAINS MODERATE Coastal PLACES have moderate climate because they are neither too hot nor so cold. This is because of water present nearby to the area which CONTROLS the heat and spread the moisture. Being on the COAST PEOPLE also EXPERIENCE humidity.

Explanation:

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2V 0

Explanation:

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ANSWER:

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Answer:

B) 2MS- 2

Explanation:

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ANSWER:

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ANSWER:

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Explanation:

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An atom is the smallest UNIT of ORDINARY MATTER that forms a chemical element. Every solid, LIQUID, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers ACROSS.

Explanation:

VEINS are BLOOD vessels that carry blood low in oxygen from the body back to the HEART for reoxygenation. Arteries and veins are two of the body's MAIN type of blood vessels. These vessels are channels that DISTRIBUTE blood to the body.

• ZENER diode is a special type of diode DESIGNED to reliably allow current to flow "backwards" when a CERTAIN set reverse voltage, known as the Zener voltage, is reached. Zener diodes are manufactured with a great VARIETY of Zener voltages and some are even variable

Answer:

A p-n junction DIODE is two-terminal or two-electrode semiconductor device, which allows the electric CURRENT in only ONE direction while blocks the electric current in opposite or REVERSE direction. If the diode is FORWARD biased, it allows the electric current flow.

Celsius and Fahrenheit are TWO SCALES USED to measure temperature. The temperature in the centigrade scale will be EXPRESSED in degrees Celsius. The temperature in the Fahrenheit scale will be expressed in degrees Fahrenheit. The relation between Celsius and Fahrenheit is proportional.

ANSWER:

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Δv = 2 v{θ/2}

    = 2 ×40 sin30

    = 80 sin 30

   = 80 ×1/2

   = 40 m/s

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<P>We have,

• FORCE(F) = 1500N
• Pressure(P) = 105N/m
• Area(A) = ?

We KNOW that,

• P = F/A
• A = F/P
• A = 1500/105
• A = 300/21
• A = 100/7
• A = 14.28m² (Required ANSWER)

ANSWER:

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ANSWER:

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Answer:

In a N-type semiconductor, the majority of charge carriers are free ELECTRONS whereas the HOLES are in minority. In a P-type semiconductor, the majority of charge carriers are holes whereas the free electrons are in minority. ... The donor energy LEVEL is close to the conduction BAND in the case of N-type SEMICONDUCTORS

ANSWER:

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ANSWER:

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Answer:

Economic infrastructure is the basic facilities which DIRECTLY benefit the process of production and distribution in an economy. Roads, railways, TELECOMMUNICATION systems, WATERWAYS, airways, financial INSTITUTIONS, electricity, water supply etc are the examples of economic infrastructure.

Explanation:

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EXPLANATION:

a mass of SMALL air BUBBLES that FORM on the surface of a liquid.

Answer:

NONE of the Above

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Answer:

A direct-current (DC) generator is a ROTATING MACHINE that supplies an electrical output with unidirectional voltage and current. ... The rotor is fitted with a mechanical rotating switch, or COMMUTATOR, that connects the rotor coil to the STATIONARY output TERMINALS through carbon brushes.

Answer:

In quantum mechanics, the UNCERTAINTY PRINCIPLE is any of a variety of MATHEMATICAL inequalities asserting a fundamental limit to the accuracy with which the values for certain pairs of physical quantities of a particle, such as POSITION, x, and momentum, p, can be predicted from initial conditions.

Answer:

3x² is the CORRECT answer.

Explanation:

dy/DX=d/DX x³+0

dy/DX=3x²

a point on the axis of a LENS that is so located that any ray of LIGHT passing through it in passing through the lens SUFFERS no net deviation and that MAY be within, without, or on EITHER surface of the lens.

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ANSWER:

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ANSWER:

Snell's law, in optics, a relationship between the PATH taken by a RAY of light in crossing the boundary or surface of separation between two contacting SUBSTANCES and the refractive index of each

Answer:

In electricity generation, a generator is a device that converts motive POWER into electrical power for USE in an external CIRCUIT. Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines, wind turbines and even HAND cranks.

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Answer:

Effects of EARTH's revolution include the seasons and variation in the length of DAYS and nights. In addition to revolution, the tilt of Earth's axis relative to its plane of ORBIT has a PROFOUND effect on Earth. At almost any given time, one HEMISPHERE is tilted toward the sun, as the other is tilted away.

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Explanation:

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ANSWER:

(B)surfaceS2

is the answer

Explanation:

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a is the SMALLEST QUANTITY

ANSWER:

The phenomena of the ATMOSPHERIC refraction are:

twinkling of stars

early Sunrise

delayed sunset

stars SEEMS higher than actual height

Explanation:

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ANSWER:

Answer:A transformer is a device that transfers electric energy from ONE alternating-current CIRCUIT to one or more other circuits, EITHER increasing (stepping up) or REDUCING (stepping down) the voltage.

ANSWER:

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Answer:

Faraday's LAW of INDUCTION (briefly, Faraday's law) is a basic law of electromagnetism predicting how a MAGNETIC field will INTERACT with an electric circuit to produce an electromotive FORCE (EMF)—a phenomenon known as electromagnetic induction.

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Answer:

The electric dipole moment is a measure of the separation of POSITIVE and negative electrical charges within a system, that is, a measure of the system's overall polarity. The SI UNITS for electric dipole moment are coulomb-meter; however, a COMMONLY used UNIT in atomic physics and chemistry is the debye.

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Answer:

Magnetic dipole, generally a TINY MAGNET of microscopic to subatomic dimensions, equivalent to a flow of electric charge around a loop. Electrons circulating around atomic nuclei, electrons SPINNING on their axes, and rotating POSITIVELY charged atomic nuclei all are magnetic dipoles.

Answer:

the centrifugal force is the force always DIRECTED TOWARDS the centre of the spinning body ALONG the axis.