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4

If a man wants to hear clearly the echo of a sound produced by him from a hill, the hill should be away from him by a minimum distance of

A. 330 m

B. 33 m

C. 16.5 m

D. 165 m

Correct Answer :

C. 16.5 m


Related Questions

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The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications of

A. Pascal's law

B. Principle of Archimedes

C. Boyle's law

D. Hooke's law

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4

Commonly used safety fuse wire is made of

A. Tin

B. Lead

C. Nickel

D. An alloy of tin and lead

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A light year means

A. a unit of time

B. a unit of length

C. a year of no consequence

D. illumination throughout the year

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When a ship floats on water, the weight or water displaced is

A. an indeterminate quantity

B. equal to the weight of the ship

C. greater than the weight of the ship

D. less than the weight of the ship

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4

Out of the following which element has the longest half-life period?

A. Radium

B. Radon

C. Uranium-238

D. Plutonium

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4

Hydrophone is an instrument used

A. for measuring relative density of liquids

B. by ships to pass on messages

C. for determining the depth of ocean bottoms etc.

D. by deaf people to aid hearing

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The hygrometer is an apparatus used for finding the

A. temperature of air

B. intensity of light

C. density of a liquid

D. relative humidity of the atmosphere

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4

Photoelectric cell is a device which converts

A. light energy into electrical energy

B. electrical energy into light energy

C. magnetic energy into electrical energy

D. electrical energy into mechanical energy

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4

To concentrate light on the defective teeth, the dentists use

A. convex mirrors

B. concave mirrors

C. convex lens

D. concave lens

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In a hydraulic pressure

A. force on each square centimetre of the small piston is less than the force on each square centimetre of the large piston

B. the distance the small piston moves is equal to the distance the large piston moves

C. applied pressure is equally transmitted throughout the liquid in all directions

D. force acting on small piston is equal to the force acting on large piston

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In a dynamo

A. mechanical energy is converted to light energy

B. mechanical energy is converted to heat energy

C. mechanical energy is converted to electrical energy

D. electrical energy is converted to mechanical energy

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4

To get 5 images of a single object one should have two plane mirrors inclined at an angle of

A. 72°

B. 60°

C. 36°

D. 90°

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A car parked in the sun with its windows closed gets terribly hot inside. This is due to

A. the heat emitted by the engine

B. the greenhouse effect

C. the good conducting power of the metal body

D. the double layered wind shield

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Separating particles from a suspension is effected by

A. centrifugal force

B. frictional force

C. gravitational force

D. distillation

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For an electron orbiting in a hydrogen atom, the necessary centripetal force keeping it in orbit is provided by

A. the electrical attraction between the negatively charged electron and the positively charged porton

B. the high speed of the electron

C. the low speed of the electron

D. gravity

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For viewing objects placed at a higher level from a position at a lower level, the instrument used' Is known aa

A. telescope

B. spectrometer

C. microscope

D. periscope

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Lightning is produced when

A. similar charges of electricity rush towards each other and then get repelled

B. clouds strike against impurities in air and the friction burns up these impurities

C. strong opposite charges in different clouds break down the resistance offered by the intervening air

D. water vapour produces electricity in the clouds

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In the nucleus of an atom, the uncharged particle is

A. proton

B. neutron

C. electron

D. positron

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The following are the atmospheric zones above the surface of the earth:
A) Troposphere
B) Ionosphere
C) Stratosphere
D) Exosphere
Select the correct sequence from the earth's surface on the basis of the codes given below:

A. ACBD

B. ABCD

C. CABD

D. BACD

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4

The plants in a greenhouse are enclosed in a glass enclosure because

A. glass allows the heat radiations of shorter wavelengths from the sun to pass through

B. the plants absorb them - these shorter wavelengths - and reradiate them in the form of longer wavelengths

C. the longer wavelengths cannot penetrate through the glass walls

D. All the above

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When a body is projected upwards

A. the time for the upward journey and downward journey are the same

B. the upward journey takes more time

C. the downward journey takes more time

D. Cant be said

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4

Which of the following is fissionable?

A. U-234

B. U-235

C. U-238

D. Both (b) and (c)

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4

The best estimates of the age of the earth comes from the studies of

A. angle of inclination of the earth

B. changes in radio-active minerals in it

C. period taken by Sun's light to reach the earth

D. artificial satellites revolving round the earth

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4

The heat generated in a conductor carrying current is proportional to

A. the resistance

B. the square of the current flowing through it

C. the time the current flows

D. All the above

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In compact porous soil, the rising of the water is due to

A. capillarity

B. cohesion

C. adhesion

D. viscosity

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The earth satellite Aryabhatta was put in orbit by India on

A. October 20, 1978

B. November 14, 1978

C. January 26, 1979

D. April 19, 1975

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When a body is partly or wholly immersed in a liquid the apparent loss of weight is equal to the weight of the liquid displaced by the submerged portion. This is known as

A. Pascal's law

B. Bernoulli's law

C. Archimedes' law

D. Boyle's law

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4

If a man wants to hear clearly the echo of a sound produced by him from a hill, the hill should be away from him by a minimum distance of

A. 330 m

B. 33 m

C. 16.5 m

D. 165 m

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4

Of the following types of electromagnetic radiation which has the longest wavelength?

A. ultraviolet rays

B. gamma rays

C. radio waves

D. infrared waves

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4

If a bar magnet is broken into two pieces

A. both pieces will lose their magnetism

B. one piece will have North Pole on both ends and the other South Pole on its both ends

C. each will remain a magnet with North Pole at one end and South Pole at the other

D. the longer piece will behave as a bar magnet while the smaller will have no magnetism at all