An alternating source is connected in series to a capacitor of capacity reactance \( 10^3 \sqrt{3} \) and a resistor of resistance 103 Ohms. The Impedance of the circuit is...
A\( 2000 \sqrt{3} \) Ohms
B2000 Ohms
C\( 1000 \sqrt{3} \) Ohms
D1000 Ohms
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Question 1762
jamb1995
The half-life of a radio-active element is 9 days, what fraction of atoms has decayed in 36 days?
A\( \frac{1}{16} \)
B\( \frac{1}{4} \)
C\( \frac{1}{2} \)
D\( \frac{15}{16} \)
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Question 1763
jamb1995
A light of energy 5eV falls on a metal and the electrons with a maximum kinetic energy of 2eV are ejected. The work function of the metal is
A0.4eV
B2.5eV
C3.0eV
D7.0eV
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Question 1764
jamb1995
The primary winding of a transformer has 400 turns and its secondary has 100 turns. If a source of e.m.f. of 12V is applied to the primary, the secondary e.m.f. will be
A3V
B6V
C24V
D48V
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Question 1765
jamb1995
Which of the following is required to convert a milliammeter to an ammeter?
AA high resistance in parallel
BA high resistance in series
CA low resistance in parallel
DA low resistance in series
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Question 1766
jamb1995
If the maximum voltage across a 100ohms resistor is 20V, then the maximum power it can dissipate is
A5.00W
B4.00W
C2.00W
D25W
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Question 1767
jamb1995
An electric current of 2 amperes flows in a heating coil of resistance 50 ohms for 3 minutes 20 seconds. Determine the heat produced
A0.5kJ
B8.0kJ
C20.0kJ
D40.0kJ
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Question 1768
jamb1995
The purpose of a dielectric material in a parallel plate capacitor is to
Aincrease its capacitance
Bdecrease its capacitance
Cinsulate the plate from each other
Dincrease the magnetic field between the plates
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Question 1769
jamb1995
A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is connected across the two terminals of the battery, the current drawn from the battery is
A16.0A
B8.0A
C0.8A
D0.4A
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Question 1770
jamb1995
If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is
A1 : 6
B1 : 3
C2 : 1
D6 : 1
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Question 1771
jamb1995
At different locations on the earth's surface, the earth's magnetic field is
Athe same in magnitude and direction
Bthe same in magnitude but different in direction
Cdifferent in both magnitude and direction
Ddifferent in magnitude but different in direction
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Question 1772
jamb1995
Two parallel plates at a distance of 8.0 x 10-3m apart are maintained at a p.d of 600 volts with the negative plate earthed. What is the electric field strength?
A4.8 Vm-1
B75.0Vm-1
C4800.0Vm-1
D75000.0Vm-1
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Question 1773
jamb1995
Which of the following pairs of colours gives the widest separation in the spectrum of white light?
ARed and Violet
BGreen and Yellow
CRed and Indigo
DYellow and Violet
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Question 1774
jamb1995
A real object is placed at a distance ucm in front of a curved mirror of focal length fcm. If the image is upright and magnified, then the mirror is
Aconvex and u =2f
Bconcave and u = 2f
Cconvex and u = f
Dconcave and u = f
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Question 1775
jamb1995
What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42?
A21o
B22o
C23o
D24o
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Question 1776
jamb1995
Total eclipse of the sun occurs when the
Aearth is between the moon and the sun
Bsun is between the moon and the earth
Cmoon is between the sun and the earth
Dozone layer is threatened
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Question 1777
jamb1995
The pitch of an acoustic device can be increased by
Aincreasing the frequency
Bincreasing the amplitude
Cdecreasing the loudness
Ddecreasing the intensity
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Question 1778
jamb1995
The difference between sound waves and light waves is that sound waves
Aare transverse while light waves are longitudinal
Brequire a medium to travel while light waves does not
Ccan be diffracted but light waves cannot
Dcannot be reflected but light waves can
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Question 1779
jamb1995
The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz?
A7500m
B300m
C75m
D15m
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Question 1780
jamb1995
Which of the following is the exclusive property of a transverse wave?
