A uniform light beam XZ is Hinged at X and kept in equilibrium by the forces T and F as shown in the diagram above. if XO = 20cm and OY = 30cm, express T in terms of F
AT =2√3/3
BT= 2F
CT = 5V3F/3
DT = 5F
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Question 802
jamb1997
The fig above shows a block of mass m sliding down a rough inclined plane QP at angle \( \theta \) . The forces acting on the block along QP are
Amg sinθ and the normal reaction
Bmg sinθ and the force of friction
Cmg sinθ and the normal reaction
Dmg cosθ and the normal reaction
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Question 803
jamb1997
For what value of \(\theta\) are the forces in the diagram above in equilibrium
A\( 15^{\circ} \)
B\( 30^{\circ} \)
C\( 45^{\circ} \)
D\( 60^{\circ} \)
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Question 804
jamb1997
Find the standard deviation of the following data -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5
A2
B3
C√10
D√11
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Question 805
jamb1997
The following are the scores of ten students in a test of 20 marks: 15, 16, 17, 13, 16, 8, 5, 16, 19, 17. What is the modal?
A13
B15
C16
D19
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Question 806
jamb1997
The graphite rods surrounding the uranium fuel rods in a nuclear reactor, are used to
Aabsorb the neutrons and hence halt the nuclear process
Bcreate the neutrons and hence slow up the nuclear process
Cslowdown the neutrons and hence slow up the nuclear process
Dspeed up the neutrons and hence speed up the nuclear process
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Question 807
jamb1997
One of the features of the fission process is that
Aits products are not radioactive
Bit leads to chain reaction
Cneutrons are not released
Dthe sum of the masses of the reactants equals the sum of masses of the products
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Question 808
jamb1997
In a purely inductive circuit, the current
Alags behind the voltage in phase by 90o
Bleads the voltage in phase by 90o
Cis in the same phase with the voltage
Dleads the voltage by 180o
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Question 809
jamb1997
The voltage of the domestic electric supply is represented by the equation V = 311 sin314.2t. Determine the frequency of the a.c. supply [\(\pi\) = 3.142]
A50.0Hz
B100.0Hz
C311.0Hz
D314.2Hz
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Question 810
jamb1997
The power dissipated in an a.c. circuit with an r.m.s, current of 5A, r.m.s voltage of 10V and a phase angle of 60o is
A25W
B50W
C120W
D125W
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Question 811
jamb1997
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 812
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 813
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 814
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 815
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 816
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 817
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 818
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 819
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 820
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
