The resistance of a 240V, 60 watt electric filament bulb is
A0.25\(\Omega\)
B480\(\Omega\)
C60\(\Omega\)
D240\(\Omega\)
E960\(\Omega\)
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Question 1162
jamb1981
When a ray of light passes from water to glass, it is
Abent away from the normal
Bbent towards the normal
Ctotally internally reflected
Dabsorbed by the glass
Ebroken into a pure spectrum
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Question 1163
jamb1981
Heat was supplied to a block of ice at 0oC until half of it melted. Which of the following statements is true?
Athe temperature rises and the ice expand
Bthe temperature remains constant and the volume of the ice decreases
Cthe ice gives out heat as it melts and the temperature decreases
Dthe mass remains constant and the temperature increases
Ethe temperature decreases because some heat is lost
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Question 1164
jamb1981
An example of a scalar quantity is
Avelocity
Bweight
Celectric charge
Dacceleration due to gravity
Emomentum
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Question 1165
jamb1981
A cell of e.m.f 2V and internal resistance 1\(\Omega\) supplies a current of 0.5 amps to a resistance whose value is
A0.5\(\Omega\)
B1\(\Omega\)
C2\(\Omega\)
D2.5\(\Omega\)
E3\(\Omega\)
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Question 1166
jamb1981
Which of the following is NOT an effect that can be produced by an electric current?
Aheat
Blight
Csound
Dmotion
Enone of the above
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Question 1167
jamb1981
Which of the following statements is applicable to a real image formed by a concave mirror? i. it can be observed on a screen ii. it is always inverted and in front of the mirror iii. it only seams to exist IV. it is formed by the actual converging of rays of light
Ai, ii and iii
Bi, ii and iv only
Ci and ii only
Di and ii only
Eall four statements
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Question 1168
jamb1981
Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?
Aconduction only
Bconvection only
Cradiation only
Dnon of these methods
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Question 1169
jamb1981
An inclined plane of angle \(\theta\), acting as a simple machine, has a velocity ratio
Asin\(\theta\)
B\(\frac{1}{\text{sin}\theta}\)
Ccos\(\theta\)
D\(\frac{1}{\text{cos}\theta}\)
Esin\(\theta cos\theta\)
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Question 1170
jamb1981
Which of the following elements are real magnetic materials?
AIron, steel and nickel
Bcopper, steel and iron
Clead, iron and brass
Dglass, lead and steel
Estone, air and iron
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Question 1171
jamb1981
If a source of sound is moving, a stationary listener will hear a sound of different frequency. This is called
ADoppler effect
BResonance
CUltra sound
DDiffraction of sound
ERarefaction
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Question 1172
jamb1981
Which of the following does NOT describe the image formed by a plane mirror?
Aerect
Blaterally inverted
Csame distance from mirror as object
Dmagnified
Evirtual
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Question 1173
jamb1981
When fixed mass of an ideal gas expands at constant temperature, which property of the gas molecule increases?
Aaverage number per unit volume
Baverage kinetic energy
Caverage speed
Daverage seperation
Eaverage number of collisions per unit time
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Question 1174
jamb1981
The principle of transmissibility of pressure in a fluid at rest in all directions is known as
AArchimede's principle
BFlotation Principle
CNewton's lwa
DPascal's law
EBoyle's law
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Question 1175
jamb1981
The following types of waves are transverse EXCEPT
Alight waves
Bradio waves
Csound waves
Dsurface waves on water
EX-rays
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Question 1176
jamb1981
The latent heat of fusion of a substance is the heat required to
Araise the temperature of unit mass of the substance by 1 oC
Bmaintain unit mass of the substance at constant temperature
Cchange unit mass of substance from solid to liquid at constant temperature
Dchange unit mass of liquid to vapour at constant temperature
Eraise the temperature of unit mass by 100oC
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Question 1177
jamb1981
A vapour is said to be saturated when?
Amore molecules return to the liquid than leave it
Ba dynamic equilibrium exists between the liquid molecules and the vapour molecules at a given temperature
Cthe vapour pressure is atmospheric
Dthe temperature of the vapour varies
Eall molecules are moving with the same speed
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Question 1178
jamb1981
The ice and steam points of mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to 3cm and 19cm lengths of the mercury thread when the length is 12cm, the temperature is
A32oC
B48oC
C56oC
D65oC
E75oC
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Question 1179
jamb1980
In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is \( \beta \) which of following statements is true???
A\( \alpha = \beta \)
Bthe efractive index of glass is \( \frac{sin\theta}{sin\alpha} \)
CThe ray suffers total internal reflection if \( \beta \) is greater than the critical angle
Dthe efractive index of glass is \( \frac{sin\alpha}{sin\beta} \)
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Question 1180
jamb1980
In the diagram above, MN is perpendicular to ON and MP. What is the difference between the moment about N of the force of 20 Newtons applied along MP and its moment about O?
