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4

A projectile is fired at an angle with the horizontal with a small velocity. Its horizontal range will be maximum when the angle with the horizontal is

A.

B. 30°

C. 45°

D. 60°

Correct Answer :

C. 45°


Related Questions

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The device for tracking and locating the position of a moving object in space is called

A. Space ship

B. Lunar module

C. Radar

D. Rocket

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The electroplating of a metallic article

A. protects the article from atmospheric corrosion

B. gives it a more attractive appearance

C. Both (a) and (b) above

D. None of the above

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A pair of stars that revolve round each other is

A. a neutron star

B. a binary star

C. a dwarf star

D. a polar star

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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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A proton is

A. the ionised hydrogen molecule

B. the nucleus of helium atom

C. the nucleus of hydrogen atom

D. the positive counterpart of electron

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Choose the correct answer

A. Microphone converts sound energy into electrical energy.

B. Electric fan converts electrical energy into mechanical energy.

C. Battery converts chemical energy into electrical energy.

D. All the above

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Expansion of a rod when heated

A. is proportional to its original length

B. is proportional to the increase of temperature

C. is inversely proportional to its original length

D. Both (a) and (b) above

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Nichrome is used in electric heaters and irons because

A. it resists oxidation when red hot

B. its melting point is high

C. it has got 60 times the resistance of copper

D. All the above

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Sound waves In 'air travel faster if

A. frequency is higher

B. wavelength is smaller

C. pitch is smaller

D. air is warmer

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A device used to measure heights above sea level is known as

A. altimeter

B. anemometer

C. dilatometer

D. potentiometer

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The inside of both the walls of a thermos flask is silvered i.e., on the vacuum side in order to reduce heat loss by

A. convection

B. radiation

C. conduction

D. All the three

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In a river, the currents are fastest where the river la

A. wide and shallow

B. narrow and shallow

C. wide and deep

D. narrow and deep

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4

The minimum velocity required by a satellite to escape earth's gravitational pull is

A. 18 km/s

B. 11.2 km /s

C. 21 km/s

D. 35 km/s

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The neutron, one of the constituent particles of which the nuclei of atoms are composed was discovered by

A. Irene Curie

B. W Bothe and H Becker

C. James Chadwick

D. Jean Joliot

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A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

A. greater than the weight of the man

B. less than the weight of the man

C. same as the weight of the man

D. zero

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The frequency of an ultrasonic wave is

A. the same as that of an audible sound

B. above the audible range

C. below the audible range

D. None of the above

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It is difficult to bon potatoes at the top or a mountain because

A. the water available is hard

B. it is colder than at sea level

C. the potatoes become hard

D. the boiling point of water is lower at that height on account of low atmospheric pressure

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Who first established the fact that the earth revolves round the sun?

A. Sir Isaac Newton

B. Kepler

C. Copernicus

D. Ptolemy

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A wire conveying a current deflects a pivoted magnetic needle. This was discovered by

A. Marconi

B. Oersted

C. Faraday

D. Ohm

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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

In a river, the currents are fastest where the river la

A. wide and shallow

B. narrow and shallow

C. wide and deep

D. narrow and deep

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4

An ammeter has

A. a high resistance

B. a very low resistance

C. no resistance at all

D. resistance of 400 � w

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The SI unit of electric current is

A. the ampere

B. the volt

C. the ohm

D. the coulomb

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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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We cannot see and without the aid of a telescope

A. Neptune and Pluto

B. Jupiter and Saturn

C. Venus and Mars

D. Venus and Saturn

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In a freezer ice cubes will be formed more quickly in trays made of

A. rubber

B. plastic

C. aluminium

D. wood

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At what temperature do the Fahrenheit and Kelvin scales give the same reading?

A. 212°

B. 32°

C. -40°

D.

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The red colour of the setting sun is due to

A. the least scattered red colour reaching the eye

B. the dispersion of sun light occurred in air molecule in atmosphere

C. the diffraction of sunrays in atmospheric layers

D. interference of all the rays coming from the sun

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The loudness of a sound is determined by

A. Frequency

B. Amplitude

C. Speed

D. Wavelength

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Holography is the technique of

A. taking photos of various objects

B. recording and reproducing three dimensional images

C. tracing out planets and stars in the sky

D. transmitting light waves