0
Q:

# The velocity required to place a vehicle in orbit round the moon is _______ that required to place it in orbit round the earth

 A) less than B) Greater than C) equal to D) greater than or equal to

Explanation:

This orbital velocity at the moon is less because orbital velocity = $\sqrt{rg}$

where 'r ' is the orbital radius. i.e the distance of the body from the center of the earth and 'g' is the acceleration due to gravity on the body in question. In the case of the moon, both r and g are less than in the case of the earth.

Subject: Physics
Exam Prep: AIEEE , GATE
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 12
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 8
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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0 92
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 69
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.

Subject: Physics Exam Prep: AIEEE , Bank Exams , CAT , GATE
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28
Q:

The ability to do work is called Energy.

 A) TRUE B) FALSE

Explanation:

Yes, the ability to do work is called Energy is True.

Subject: Physics
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0 30
Q:

Sound waves cannot travel through

 A) Gas B) Liquid C) Vacuum D) Solid

Explanation:

Sound waves cannot travel through a Vacuum.

A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work in.

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0 29
Q:

Which of the following is the fastest communication channel?

 A) Microwave B) Optical fiber C) Radio wave D) All are operating at nearly the same propagation speed