A cell gives a current of 0.15A through a resistance of 8\(\Omega\) and 0.3A. When the resistance is changed to 3\(\Omega\) the internal resistance of the cell is
A0.05\(\Omega\)
B1.00\(\Omega\)
C1.50\(\Omega\)
D2.00\(\Omega\)
E2.50\(\Omega\)
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Question 1062
jamb1985
Which of the following methods CANNOT be used to produce a steel magnet? The
Apassing of an electric current through a solenoid
Brepeated stroking of the specimen with a magnet
Crepeated stroking of the specimen in opposite directions with magnets
Dheating of the specimen
Ehammering of the specimen in the earth's magnetic field
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Question 1063
jamb1985
If the distance between two stationary charged particle is doubled, the magnitude of the electro-static force between them will be
Adoubled
Bhalved
Ca quarter of its former value
Dunchanged
Efour times the original value
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Question 1064
jamb1985
A charge of one coulomb liberates 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to librate 1.98g of copper in such a process?
A5 mins
B30 mins
C50 mins
D60 mins
E120 mins
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Question 1065
jamb1985
A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that
Awhite light is an electromagnetic wave
Bthe prism has all the colours of the white light
Cwhite light has undergone total internal reflection in the prism
Ddifferent colours of white light travel with different speeds in glass
Ewhite ligth consist of yellow, green and red colours
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Question 1066
jamb1985
Two rays of light from a point below the surface of water are equally inclined to each other at 60o in water. What is the angle between the rays when they emerge into air? (Take the refractive index of water to be \(\frac{4}{3}\))
A41.8o
B44.1o
C60.0o
D83.6o
E120.0o
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Question 1067
jamb1985
A convex mirror is used as a driving mirror because i. its image is erect. ii. it has a large field of view. iii. it has a long focal length. Identify the CORRECT statement(s)
Ai andiii only
Bi and ii only
Cii and iii only
Di, ii, and iii only
Ei only
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Question 1068
jamb1985
A 45o triangular glass prism can be used as a reflector of light because
AA refraction never takes place in such a prism
Bthe angle of reflection equals the angle of incidence
Cthe refractive index of glass is less than 1
Dit is transparent
Ethe critival angle angle for glass is less than 45o
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Question 1069
jamb1985
An object is placed 15cm in front of a concave mirror of radius 40cm. The image formed
Avirtual and 60cm behind the mirror
Breal and 60cm behind the mirror
Cvirtual and at infinity
Dreal and at infinity
Evirtual and 40cm from the mirror
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Question 1070
jamb1985
If the fundamental frequency of a closed pipe organ on a day when the speed of sound is 340ms-1 is 170Hz, then the length of the pipe is
A50cm
B70cm
C100cm
D150cm
E200cm
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Question 1071
jamb1985
When a sound wave passes from air into water its
Aspeed and frequency increases but its wavelength remains the same
Bspeed and wavelength increases but its frequency remains the same
Cspeed decreases
Dspeed remains the same but its frequency and wavelength change
Espeed increases but its frequency and wavelength decreases
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Question 1072
jamb1985
In order to find the depth of the sea, a ship sends out a sound wave and receives an echo after one second. If the velocity of sound in water is 1500ms-1, what is the depth of the sea?
A0.75km
B1.50km
C2.20km
D3.00km
E3.75km
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Question 1073
jamb1985
Which of the following phenomena CANNOT be explained by the molecular theory of matter?
AExpansion
BConduction
CConvection
DRadiation
EEvaporation
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Question 1074
jamb1985
Which of the following statements are NOT correct?
Aboiling occurs when the saturated vapour pressure of the liquid involved equals the external pressure
Bboth the boiling point and the saturated vapour pressure of a given liquid depends on the external pressure
Cthe saturated vapour presssure rises with increase in temperature
Dthe saturated vapour pressure is independent of the volume available for the vapour
Eit is possible to boil water at a lower temperature than 100oC at high altitude
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Question 1075
jamb1985
A good calorimeter should be of
Alow specific heat capacity and low heat conductivity
Blow specific heat capacity and high heat conductivity
Chigh specific heat capacity and high heat conductivity
Dhigh specific heat capacity and low heat conductivity
Edull surface and low heat conductivity
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Question 1076
jamb1985
Two thermo flasks of volume Vx and Vy are filled with liquid water at an initial temperature of 0oC. After sometime the temperature were found to be 9x, 9y, respectively. Given that \(\frac{Vx}{Vy}\) = 2 and \(\frac{\theta x}{\theta y}\) = \(\frac{1}{2}\) the ratio of the heat flow into the flask is
A\(\frac{1}{4}\)
B\(\frac{1}{2}\)
C4
D1
E2
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Question 1077
jamb1985
Water shows anomalous behaviour.
Abelow 0oC
Bbetween 0oC and 4oC
Cat exactly 4oC
Dbetween 4oC and 100oC
Eabove 100oC
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Question 1078
jamb1985
In a gas experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. the unit of the slope of the resulting curve is
Aforce
Bforce/m
Cwork
Dforce/m3
Eenergy/m3
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Question 1079
jamb1985
A quantity of gas occupies a certain volume when the temperature is -73oC and the pressure is 1.5 atmospheres. If the pressure is increased to 4.5 atmospheres and the volume is halved at the same time, what will be the new temperature of the gas?
A573oC
B327oC
C300oC
D110oC
E27oC
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Question 1080
jamb1985
Two liquids, P at a temperature of 20oC and Q at a temperature of 80oC have specific heat capacities of 1.0Jkg-1oC-1 and 1.5J kg-1oC-1respectively. if equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is
