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Q:

Calculate the frequency (in Hz) of a sound wave of wavelength 4m travelling with a speed of 200 m/s.

A) 50 B) 800
C) 100 D) 400
 
Answer & Explanation Answer: A) 50

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Exam Prep: Bank Exams , CAT

2 1418
Q:

What is the name of the device used to convert alternating current into direct current ?

A) Ammeter B) Galvanometer
C) Rectifier D) Transformer
 
Answer & Explanation Answer: C) Rectifier

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0 1417
Q:

The energy obtained from atoms is known as.........

A) Solar energy B) Heat energy
C) Nuclear energy D) Chemical energy
 
Answer & Explanation Answer: C) Nuclear energy

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Exam Prep: CAT , Bank Exams , AIEEE

0 1414
Q:

If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?

A) lUV < lIR < lVIS B) lUV > lVIS > lIR
C) lUV > lIR > lVIS D) lUV < lVIS < lIR
 
Answer & Explanation Answer: D) lUV < lVIS < lIR

Explanation:

Infrared radiation, what we experience as heat when we hold our hand near a warm object, is somewhat longer wavelengths than visible light. Visible light is simply electromagnetic radiation in a range of wavelengths that our eyes are sensitive to. Visible wavelengths range from 0.0007 milimeters for red light, through orange, yellow, green, and blue, to 0.0004 milimeters for violet light. Ultraviolet is shorter wavelengths than violet.

Longer the wavelength,lower the energy

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0 1414
Q:

An image formed by a concave mirror on a screen is called __________?

A) Virtual image B) Real image
C) Inverted image D) Erect image
 
Answer & Explanation Answer: B) Real image

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3 1411
Q:

Anemometer is an instrument meant for measuring __________

A) velocity B) air masses
C) wind speed D) temperature
 
Answer & Explanation Answer: C) wind speed

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0 1409
Q:

During the motion of a projectile fired from the earth surface, _______

A) its kinetic energy remains constant B) its momentum remains constant
C) vertical component of its velocity remains constant D) horizontal component of its velocity remains constant
 
Answer & Explanation Answer: D) horizontal component of its velocity remains constant

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1 1407
Q:

An object having a capability to do work is said to possess __________.

A) force B) moment
C) momentum D) energy
 
Answer & Explanation Answer: D) energy

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3 1405