A force of 5N act at a point Y on a rod XYZ as shown in the diagram above, if XY is 2m. What is the moment of the force about point X?
A0Nm
B3Nm
C7Nm
D10Nm
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Question 2
jamb1990
What is the average velocity of the sprinter whose velocity time graph is as shown above
A85.0ms-1
B17.0ms-1
C8.5ms-1
D1.7ms-1
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Question 3
jamb1990
Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is
A2√3/3N
B√2N
C4√3/3
D2V3N
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Question 4
jamb1990
What is the reading of the vernier scale above
A1.88cm
B1.80cm
C1.28cm
D1.97cm
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Question 5
jamb1990
The photocell works on the principle of the
Avoltaic cell
Bemision of electrons by incident radiation
Cemision of protons by incident electrons
Dphotographic plate
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Question 6
jamb1990
A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?
A200
B1200
C1600
D2400
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Question 7
jamb1990
What precaution should a manufacturer take to ensure that energy loss in a transformer is minimized?
Athe winding of the transformer should be made of high resistance wire
Bthe core should be made of thin sheets of metal
Cno magnetic material should be used to make the core
Dthe flux linking the primary with the secondary coils should be minimum
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Question 8
jamb1990
The number of neutrons contained in the nucleus \(^{238}_{92}U\) is
A92
B146
C238
D330
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Question 9
jamb1990
A 0 - 10mA galvanometer with a coil resistance of 30\(\Omega\) can be converted to a 0 - 10A ammeter by using
A0.03\(\Omega\) series resistor
B0.03\(\Omega\) shunt resistor
C9.99\(\Omega\) shunt resistor
D9.99\(\Omega\) series resistor
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Question 10
jamb1990
A lamp is rated 240V, 60W. The resistance of the filament is
A960\(\Omega\)
B16\(\Omega\)
C15\(\Omega\)
D4\(\Omega\)
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Question 11
jamb1990
Electrical power is transmitted at a high voltage rather than low voltage because the amount of energy loss is reduced due to
Aheat dissipation
Bproduction of eddy currents
Cexcessive current discharge
Dexcessive voltage distance
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Question 12
jamb1990
Which of the following is most suitable for protecting the circuit of 2000W electric iron connected to a 250V mains?
A13A
B8A
C5A
D3A
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Question 13
jamb1990
Which of the following is an essential physical property of the wires used for making fuses?
Alow density
Bhigh thermal conductivity
Clow electrical resistivity
Dlow melting point
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Question 14
jamb1990
The total energy required to send a unit positive charge round a complete electrical circuit is the
Akinetic energy
Bpotential difference
Celectromotive force
Delectrical energy
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Question 15
jamb1990
When a known standard resistor of 2\(\Omega\) is connected to the 0.0cm end of a meter bridge, the balance point is found to be at 55.0cm. What is the value of the unknown resistor?
A1.10\(\Omega\)
B1.64\(\Omega\)
C2.44\(\Omega\)
D27.50\(\Omega\)
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Question 16
jamb1990
Three cells each of e.m.f. 1.5v and an internal resistance of 1.0\(\Omega\) are connected in parallel across a load resistance of 2.67\(\Omega\). Calculate the current in the load?
A0.26A
B0.41A
C0.50A
D0.79A
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Question 17
jamb1990
Which of the following is a vector?
AElectric charge
BElectric field
CElectrical potential difference
DElectrical capacitance
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Question 18
jamb1990
Which of the following statements are true of an insulated charged body carrying positive charge? i. it contains excess positive charges. ii. it creates an electric field. iii. it possesses potential energy. iv. it carries electric current.
Ai and iv only
Bi and ii only
Ci, ii, iii only
Di, ii, iii and iv
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Question 19
jamb1990
One of the properties of the earth's magnetic field is that the
Anorth pole lies in the northern hemisphere
Bgeographic and magnetic meridians coincide
Cearth's magnetic flux is entirely horizontal at a place where the magnetic dip is zero
Dearth's magnetic flux is entirely vertical at a place where the magnetic dip is zero
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Question 20
jamb1990
A sonometer wire of length 100cm under a tension of 10N, has a frequency of 250Hz. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350Hz. The new tension is
