An object of mass m and volume v, is totally immersed in a liquid of density p. The tension of a string holding it is
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1980
A milliameter of resistance 5\(\Omega\) and full scale deflection of 5m A is to used to measure a potential difference of 50 V. The resistance of the multiplier should be
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1980
A tugboat is travelling from Asaba to Onitsha across the River Niger with a resultant velocity of 20 knots. If the river flows at 12 knots, the direction of motion of the boat relative to the direction of water flow is
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1980
A stand-by generator is connected to fifteen 40 W lamps and musician's 600 W amplifying system. How much energy is used if the generator runs for 6 hours?
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1980
In sunlight, a blue flower looks blue because we see the flower by the light it
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1980
In a compound microscope
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1980
Which of the following statements about sound is NOT true?
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1980
If the volume of a fixed mass of a gas is kept constant, the pressure of the gas
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1980
Heat is supplied to a block of ice 0o until half of it has melted. Which of the following statements is true?
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1980
A calorimeter of thermal capacity 80J contains 20g of water at 25oC. Water at 100oC is added so that the final temperature of the set-ups is 50oC. The amount of water added is (Heat capacity of water = 4.18J/g/oC)
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1980
Which of the following elements is the best absorber of X-rays?
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1980
Which of the following radiations cannot be deflected by a magnetic field?
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1980
The best material for the core of the primary and secondary coils of an induction coil is
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1980
High Tension(H.T.) transmission means
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1980
In the process of electrification by induction, the amount of induced charge in relation to the inducing charge is the
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1980
According to Ohm's law, the ratio V/I is constant for
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1980
A cell has an open circuit voltage V1 and a closed circuit voltage V2 when a current is flowing through it. Therefore, the internal resistance of the cell is
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1980
A man stands one-third of the way between two walls and claps his hands. He hears two distinct echoes 1s apart. If the speed of sound is 330ms-1, the distance between the wall is
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1980
the ratio of the linear expansivity of copper to that of iron is approximately 1.5. A specimen of iron and a specimen of copper expands by the same amount per unit rise in temperature. The ratio of their length is