5
Q:

# In very cold countries alcohol is used as a thermometric liquid because

 A) alcohol is a poor conductor of heat B) alcohol can be coloured for its level to be seen easily C) its freezing point is very low D) it will not stick to the glass tube

Answer:   C) its freezing point is very low

Explanation:

Alcohol has a freezing point as low as $-{117}^{o}C$. So it won't freeze even in very cold countries.

Subject: Physics
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Q:

What color does blue and yellow make?

 A) Green B) Black C) Red D) White

Explanation:

Mixing of blue and yellow colors make Green Color.

RYB (an abbreviation of red–yellow–blue) is a historical set of colors used in subtractive color mixing and is one commonly used set of primary colors. It is primarily used in art and design education, particularly painting.

RYB predates modern scientific color theory, which has determined that cyan, magenta, and yellow are the best set of three colorants to combine, for the widest range of high-chroma colors.

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0 66
Q:

Which is the point from where an azimuth originates?

 A) South B) North C) East D) West

Explanation:

The azimuth originates at true North i.e, the azimuth originates from the north point. It is a measure of how far an object forms the observer's north point.

Azimuth is a technical mapping term which is used to describe the direction of an angle between north and south on a compass circle through which the circle line passes. It is the most common military method to express direction. When using an azimuth, the point from which the azimuth originates is the center of an imaginary circle.

2 42
Q:

Which is a common first indicator of an approaching thunderstorm?

 A) too hot B) heavy wind C) a buildup of dark clouds D) lightning

Explanation:

The first indicator of an approaching thunderstorm is a buildup of dark clouds.

A thunderstorm is a storm with lightning and thunder; it is usually produced by heavy rain, gusty wind, and the cumulonimbus cloud. The thunderstorm is made up of moisture, unstable air and lift.

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0 64
Q:

 A) detecting and locating the position of objects such as Aeroplanes B) locating submerged submarines C) locating geostationary satellites D) receiving a signals in a radio receiver

Answer & Explanation Answer: A) detecting and locating the position of objects such as Aeroplanes

Explanation:

A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects.

Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.

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0 82
Q:

The absorption of ink by blotting paper involves

 A) viscosity of ink B) diffusion of ink through the blotting C) capillary action phenomenon D) siphon action

Explanation:

The absorption of ink by blotting paper involves capillary action phenomenon because the blotting paper is a thin and a smooth paper which allows a little thicker liquids like ink to absorb.

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1 45
Q:

Light from the sun reaches us in nearly

 A) 5 min B) 4.30 hrs C) 8 min D) 5.30 hrs

Explanation:

The light from the sun takes about 8 minutes to reach the Earth after it has been emitted from the sun's surface.

The time it takes for light to reach planets in our Solar System varies from about 3 minutes for Mercury to about 5.3 hours for Pluto.

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1 128
Q:

Which component of an IED creates an electrical charge?

 A) activator B) fuse C) explosive D) power source

Explanation:

The power source such as a Battery of an IED creates an electrical charge.

What are IED's ::

An Improvised Explosive Device (IED) is a bomb constructed and deployed in ways other than in conventional military action. It may be constructed of conventional military explosives, such as an artillery shell, attached to a detonating mechanism. IEDs are commonly used as roadside bombs.

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0 98
Q:

What is a Contact Force and explain with an example?

A Contact force is a force applied to a body by another body that is in contact with it. Contact force acts on a point of direct contact between the two objects. This force can either be continuous as a continuous force or can be momentary in the form of an impulse. Contact force is governed by Newton’s Laws.

Examples :: Contact force is responsible for most of the interactions we experience in the daily life.

1. Writing your name with a pen, pushing a car up a hill, lifting an object, etc...

2. Kicking a ball, hammering a nail, etc...

are some of the everyday examples where contact forces are at work.

In the first case, the force is continuously applied by the person on the car or pen or an object while in the second case the force is delivered in a short impulse.

Contact forces are often decomposed into orthogonal components

one perpendicular to the surface in contact called the normal force, and

one parallel to the surface in contact, called the friction force.