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Entrance Exam Questions of Class 11 (Physics )

Question	Option1	Option2	Option3	Option4	Answer
Total internal reflection can occur when lights passes from:	a denser to rarer medium	a rarer to denser medium	one medium to another of equal refractive index	medium to another of equal absorption coefficient	1
Sound energy is converted into electrical energy in a:	loud speaker	microphone	sonometer	earphone	2
The numerical value of average velocity to average speed is:	always less than one	always greater than one	always equal to one	equal or less than one	1
Newton’s first law of motion gives the concept of:	energy	work	inertia	momentum	3
The mass of a particle at the centre of the earth is:	zero	slightly more than at the poles	infinite	same as at the poles	4
The rear view mirror in a car is:	plane mirror	concave mirror	convex mirror	None	3
A convex mirror gives an image which is:	real and inverted	virtual and inverted	virtual and erected	virtual and magnified	3
A boat full of scrap iron is floating on water in a lake. If all the iron is dropped into water the water level will:	go up	remain the same	rise very high	fall down	4
The velocity of electromagnetic wave is:	2 ×10#8m/s	3 ×10#11cm/s	332m/s	3 ×10#8m/s	4
An object is projected upwards with a velocity of 100 m/s. It will strike the ground in about:	5s	10s	20s	15s	3
An iron ball and a wooden ball of the same radius are released from the same height h in vacuum. The time taken by both of them to reach the ground are:	roughly equal	zero	exactly equal	unequal	3
When the resultant force on a body is not zero it produces:	linear acceleration	angular acceleration	constant velocity	inertia	1
The most characteristic property of a liquid is:	elasticity	fluidity	formlessness	volume conservation	4
The velocity of sound is largest in:	air	water	steel rod	kerosene oil	3
A bulb is marked 110W-220V. The resistance of the filament is:	110 ohm	220 ohm	440 ohm	2 ohm	3
A rocket works on the principle of:	conservation of mass	conservation of energy	conservation of linear momentu	conservation of angular momentum	3
Of the following which is not a scalar quantity?	time	momentum	volume	density	2
Pressure exerted by a liquid depends upon:	density	surface tension	viscosity	buoyancy	1
Principle of transmission of pressure is stated by:	Charle’s law	Newton’s law	Pascal’s law	Boyle’s law	3
Water reservoirs are made thicker at the bottom rather than at the top because:	water is denser at the bottom	pressure is greater at the bottom	P.E. of water is greater at the bottom	K.E. of water is greater at the bottom	2
Atmospheric pressure is measured by using:	hydrometer	thermometer	calorimeter	barometer	4
A piece of ice is floating in jar containing water. When the ice melts then the level of water:	rises	falls	remains unchanged	rises or falls depending on the mass of the ice	3
Which one of the following would a hydrogen balloon find easiest to lift?	1 kg of steel	1 kg of lightly packed feather	1 kg of water	all the same	2
A conical vessel of vertical height h filled with a liquid of density d rests on its base. If g is the acceleration due of gravity, the pressure at the point on the base is:	1/3 dgh	1/2 dgh	2/3 dgh	dgh	4
A wooden cube just floats inside the water when a 200 gm mass is placed on it. When the mass is removed the cube is 2 cm above the water level. The side of the cube is:	5 cm	10 cm	15 cm	20 cm	2
The walls of the music concert halls:	amplify sound	refract sound	produce reverberation	absorb sound	3
A body of volume 100 cc immersed completely in water contained in a jar. The weight of water and jar before immersion of the body was 700 gm. After immersion, the weight of water and jar will be:	500 gm	700 gm	100 gm	800 gm	4
The internal energy of a gas molecule of an ideal gas depends on:	pressure alone	volume alone	temperature alone	none	3
Sound when a tuning fork vibrates the waves produced in the fork are:	longitudinal	transverse	progressive	stationary	4
Which one of the following characteristics of the sound is affected by the change in temperature?	wavelength	amplitude	intensity	frequency	1
A man is standing between the two cliffs. On clapping his hands a series of echoes are heard at the intervals of 1.5 sec. If the speed of sound is 350 m/s the distance between two cliffs is:	175 m	350 m	525 m	700 m	3
The distinction between the voice of a man and that of woman is possible because of difference between:	loudness of two sounds	intensity of two sounds	pitch of two sounds	quality of two sounds	3
The speed of sound in air is 350 m/s. The frequency of the tuning fork that produces sound wave of wavelength 7x10-3 m in air is:	4000 Hz	4200 Hz	4500 Hz	50000 Hz	4
The factor that helps to recognize a person by his voice is:	loudness	pitch	intensity	quality	2
Decibel is the unit of:	light intensity	sound intensity	heat intensity	none of above	2
What causes reverberation?	reflection	refraction	interference	absorption	1
In an empty hall, we hear sounds louder than in a hall packed with people. It is because of:	less absorption of sound	doppler effect	refraction of sound	change in speed of sound	1
The weightlessness is experienced while orbiting the earth in a spaceship is the result of:	centripetal acceleration	zero acceleration due to gravity	inertia	none	2
The escape velocity of a projectile from the earth is approximately:	7 km/s	11.2 km/s	1.1 km/s	11.2 m/s	2
An object is projected upwards with a velocity of 100 m/s. It will strike the ground in about:	5s	10s	20s	15s	3
A stone dropped from a bridge reaches the bottom in 4s. The height of the bridge is:	78.4 m	64 ft	2000 cm	260 m	1
A ball drawn vertically upwards with an initial velocity of 19.6 m/s returns in 4s. The maximum height attained by the ball is:	19.6m	26.7m	9.8m	none	1
Ball pen functions on the principle of:	viscosity	Boyle’s law	gravitational force	surface tension	4
Sound waves in air are:	transverse wave	longitudinal wave	may be both types	none	2
Which is used in measurement of high temperature:	mercury thermometer	platinum resistance thermometer	thermo electric pyrometers	none	3
The thermal capacity of 40gm of aluminum of specific heat 0.2 cal/gm0C is:	0.4 cal/oC	160 cal/oC	8 cal/oC	4000 cal/oC	3
Mercury thermometer can be used to measure temperature up to:	360 oC	500 oC	212 oC	100 oC	3
When 20 gm of water is heated from 10 oC to 15 oC , the required energy in joule is:	420	22	44	1000

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