What is the total electrical energy consumed by using an electric cooker rated 1000W for 5 hrs?
A5.3 x 103J
B6.5 X 103J
C1.8 X 107J
D2.3 X 107J
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Question 32
jamb1997
Two 50\(\mu\)F parallel plate capacitors are connected in series. The combined capacitor is then connected across a 100-V battery. The charge on each plate of the capacitor is
A5.00 x 10-5C
B2.50 x 10-3C
C1.25 x 10-3C
D1.00 x 10-2C
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Question 33
jamb1997
In a meter bridge experiment, two resistor 2\(\Omega\) and 3\(\Omega\) occupy the left and right gaps respectively. Find the balance point from the left side of the bridge
A20cm
B40cm
C60cm
D80cm
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Question 34
jamb1997
If 8 x 10\(^{-2}\) J of work is required to move 100\(\mu\)C of charge from a point X to a point Y in an electrical circuit, the potential difference between X and Y is
A4.0 x 102 v
B4.0 x 104 v
C8.0 x 102 v
D8.0 x 10-2 v
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Question 35
jamb1997
A galvanometer of internal resistance 50\(\Omega\) has a full scale deflection for a current of 5mA. What is the resistance required to covert it to a voltmeter with full scale deflection of 10V?
A1750\(\Omega\)
B1950\(\Omega\)
C2000\(\Omega\)
D2500\(\Omega\)
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Question 36
jamb1997
Three electric cells each of e.m.f 1.5V and internal resistance of 1.0\(\Omega\) are connected in parallel across an external resistance of \(\frac{2}{3}\)\(\Omega\). Calculate the value of the current in the resistor
A0.5 A
B0.9A
C1.5A
D4.5A
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Question 37
jamb1997
The electromagnetic waves that are sensitive to temperature changes are
AX-rays
BGamma-rays
CUltra-violet rays
DInfra-red rays
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Question 38
jamb1997
Light of velocity 3 x 108ms-1 is incident on a material of reflective of index n. If the velocity of light is reduced to 2.4 x 108ms-1 in the material, what is n?
A2.33
B2.25
C1.33
D1.25
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Question 39
jamb1997
A boy on looking into a mirror observed that his face appeared to have grown bigger. The boy must have been looking at a
Aconvex mirror with his face at the focus
Bconcave mirror with his face between the focus and the mirror
Cconcave mirror with his face at the focus
Dconvex mirror with his face between the focus and the mirror
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Question 40
jamb1997
If the load at the end of a sonometer wire is immersed in a bucket of water, the original fundamental frequency of the wire could be restored by
Adecrease the length of the wire
Bincreasing the length of the wire
Cincreasing the mass per unit length of the wire
Dchanging the temperature of the wire
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Question 41
jamb1997
The colours seen in the thin films of oil on the road and in soap bubbles are due to
Areflection
Binterference
Cdiffraction
Dpolarization
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Question 42
jamb1997
Under constant tension and constant mass per unit length, the note produced by a plucked string is 500Hz when the length of the string is 0.90m. At what length is the frequency 150Hz?
A3m
B4m
C5m
D6m
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Question 43
jamb1997
Ripples on water and light waves are similar because both?
Ahave the same frequency
Bcan be refracted and diffracted
Care longitudinal waves
Dhave the same velocity
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Question 44
jamb1997
What happens when a gas expands at constant temperature?
Aits pressure decreases
Bthe total momentum of its molecules remains constant
Cits pressure decreases and the total momentum of its moleculees remains constant
Dits pressure decreses and the total kinetic energy of its molecule decreases
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Question 45
jamb1997
A mass of a liquid at 30oC is mixed with a mass of the same liquid at 70oC and the temperature of the mixture is 45oC. Find the ratio of the mass of the cold liquid to the mass of the other liquid.
A3 : 5
B5 : 3
C3 : 7
D7 : 3
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Question 46
jamb1997
A heating coil rated at 100W is used to boil off 0.5kg of boiling water. The time taken to boil off the water is [specific latent heat of vaporization of water = 2.3 x 106Jkg-1]
A1.15 x 109 s
B1.15 x 107 s
C1.15 x 105 s
D1.15 x 104 s
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Question 47
jamb1997
What happens when a, certain quantity of pure ice is completely changed to water at 0oC?
Alatent heat is absorbed, the mass remains constant, and the volume decreases
Blatent heat is given out, the mass remains constant and the volume decreases
Clatent heat is given out, the mass increases and the volume remains constant
Dlatent heat is absorbed, the mass decreases and the volume increases
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Question 48
jamb1997
Before starting a journey, the tyre pressure of a car was 3 x 105Nm-2 at 27oC. At the end of the journey, the pressure rose to 4 x 105Nm-2. Calculate the temperature of the tyre after the journey, assuming the volume is constant
A400oC
B300oC
C273oC
D127oC
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Question 49
jamb1997
Equal masses of copper and rubber are raised to the same temperature. After sometimes, the copper was observed to be at a lower temperature because
Athe specific heat capacity of copper is lower than that of rubber
Bcopper expands more than rubber
Cthe specific heat capacity of rubber is lower than that of copper
Drubber expands more than copper
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Question 50
jamb1997
The length of mercury thread when it is at 0°C, 100°C and at an unknown temperature \(\theta\) is 25mm, 225mm and 175mm respectively. The value of \(\theta\) is
