Find the work done in moving a 2 C charge between two points X and Y in an electric field if the potential difference is 100 volts
A50J
B100J
C200J
D400J
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Question 782
jamb1998
Which of the following can be used to reduce local action in a Laclanche cell?
AA carbon rod as the positive pole
BPure zinc as the negative pole
CPotassium permanganate solution in contact with the positive pole
Dcommon salt solution
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Question 783
jamb1998
An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because
Aebonite has a negative charge while glass has a positive charge
Bebonite has a positive charge while glass has a negative charge
Cboth have negative charges
Dboth have positive charges
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Question 784
jamb1998
The force of repulsion between two point positive charges 5\(\mu\)C and 8\(\mu\)C separated at a distance of 0.02m apart is. [\(\frac{1}{4{\pi}{\varepsilon}_o}\) = 9 x 10\(^9\)Nm\(^2\)C\(^{-2}\)]
A1.8 x 10-10N
B9.0 x 10-8N
C9.0 x 102N
D4.5 x 103N
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Question 785
jamb1998
Which of the following are true about the infra-red radiation? i. it is invisible ii. it is called heat ray iii. its frequency is higher than that of blue light iv. it travels as a transverse wave
Ai, ii, iii and iv
Bi, ii, iv only
Ci, iii, iv only
Dii, iii, iv only
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Question 786
jamb1998
A man wears convex lens glasses of focal length 30cm in order to correct his eye defect. instead of the optimum 25cm, his least distance of distinct vision is
A14cm
B28cm
C75cm
D150cm
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Question 787
jamb1998
The displacement d produced in a glass block of thickness t and refractive index n when an object is viewed through it is
At – n
Bt (1 + 1/n)
Ct (1-1/n)
Dt (1/n - 1)
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Question 788
jamb1998
The most suitable type of mirror used for the construction of the search light is the?
Aconcave mirror
Bconvex mirror
Cspherical mirror
Dparabolic mirror
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Question 789
jamb1998
An object is placed in front of two plane mirrors inclined at an angle of 0o. If the total number of images formed is 7, Find the value of \(\theta\)
A30o
B45o
C51o
D90o
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Question 790
jamb1998
An object 0 lies at a distance m in front of concave mirror of focal length f. If m < f, then the final image obtained will be
Avirtual and diminished
Bmagnified and erect
Creal and inverted
Ddiminished and erect
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Question 791
jamb1998
In a resonance tube experiment, if the fundamental frequency of the vibrating air column is 280Hz, the frequency of the third overtone is
A70Hz
B840Hz
C1120Hz
D1960Hz
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Question 792
jamb1998
A steel wire of length 0.50m is stretched between two fixed points and its fundamental frequency is 200Hz. The speed of the wave in the wire is
A100ms-1
B120ms-1
C200ms-1
D250ms-1
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Question 793
jamb1998
In a closed organ pipe producing a musical note, an antinode will always be produced at
Athe closed end
Bthe open end
Cthe middle
Dall the parts of the pipe
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Question 794
jamb1998
The physical properties of sound waves can best be described by
Areflection and diffraction
Bpolarization and reflection
Cpolarization and diffraction
Dpolarization and refraction
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Question 795
jamb1998
One valid assumption of the kinetic theory of gasses is the
Athe molecules of a gas are constantly in a state of motion and the number of collision remains constant
Bthe number of molecule of gas increases with increasing pressure
Cas the temperature increases, the number of collision made by the gas molecule remains constant
Dthe molecules of gas are all identical and are very small in size
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Question 796
jamb1998
A vapour is said to be saturated when
Amore molecules return to the liquid than the amount that left it
Ba dynamic equilibrium exists between the molecules of the liquid and the vapour molecules at a given temperature
Cthe vapour pressure is equal to the atmospheric pressure
Dall molecules are moving with the same speed in all directions at a given temperature
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Question 797
jamb1998
How many grams of water at 17oC must be added to 42g of ice at 0oC to melt the ice completely? [specific latent heat of fusion of ice = 3.4 x 105Jkg-1, specific heat capacity of water = 4200Jkg-1k-1]
A200g
B300g
C320g
D400g
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Question 798
jamb1998
A 500W heater is used to heat 0.6kg of water from 25ºC to 100ºC in t\(_1\) seconds. If another 1000W heater is used to heat 0.2kg of water from 10ºC to 100ºC in t\(_2\), seconds, find \(\frac{t_1}{t_2}\)
A50
B5
C5/4
D1/5
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Question 799
jamb1998
A gas has a volume of 100cm3 at 27oC. If it is heated to temperature T until a final volume of 120cm3 is attained, calculate T
A33oC
B60oC
C87oC
D114oC
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Question 800
jamb1998
The linear expansivity of brass is 2 x 10-5C-1. If the volume of a piece of brass is 15.00cm3 at 00C, What is the volume at 100oC?
