A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are
A0o and 0o
B60o and 60o
C90o and 90o
D90o and 0o
E0o and 90o
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Question 2254
jamb1982
A high-resistance voltmeter reads 3.0V when connected across the terminals of a battery on open circuit and 2.6V when the battery supplies a current of 0.2A through a lamp. The resistance of lamp is
A2.00\(\Omega\)
B13.00\(\Omega\)
C0.52\(\Omega\)
D0.13\(\Omega\)
E1.50\(\Omega\)
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Question 2255
jamb1982
A heater marked 50W will evaporate 0.005kg of boiling water in 50 seconds. The specific latent heat of vaporization of water in J/kg is
A5.0 x 106
B1.0 x 106
C2.5 x 106
D2.5 x 105
E5.0 x 105
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Question 2256
jamb1982
Which of the following statements is true of a body which is moving in a straight line with uniform acceleration? The velocity of the body
Ais also uniform
Bmust always be zero when the body stops accelerating
Cwill increase with time in the direction of the acceleration
Dis equal to the quotient of distance travelled and time
Eis the product of the distance travelled and time
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Question 2257
jamb1982
A rocket burns 0.01kg of fuel each second and ejects it as a gas with a velocity of 5,000m/s. What force does the gas exert on the rocket?
A500,000N
B500N
C50N
D5,000N
E50,000N
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Question 2258
jamb1982
Which of the following statements is NOT true of \(\gamma\)-rays?
A\(\gamma\)-rays belong to the electromagnetic spectrum
B\(\gamma\)-rays do not carry an electron charge
C\(\gamma\)-rays obey the inverse cube law in air
Dthe thickness of aluminium which stops b-particule has a negligible effect on \(\gamma\)-radiation
Ethe difference between \(\gamma\)-rays and X-rays is that \(\gamma\)-rays originate from energy charges in the nuclei of atoms, while X-rays comes from energy charges associated with the electron structure of atoms
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Question 2259
jamb1982
As a positively charge rod is brought nearer to the top cap of a positively charged gold leaf electroscope, the divergence of the leaves will
Adecrease to zero
Bsteadily increase
Cdecrease to zero and then increase
Dremain constant
Eincrease to a maximum and then decrease
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Question 2260
jamb1982
In copper plating, a current of 0.5A is allowed for cathode area of 100cm2. If this current is maintained constant for 100 minutes, the thickness of the copper deposited will be approximately (the electrochemical equivalent of copper = 0.0003g/oC, density of copper = 10^4g/cm3 )
A10-2mm
B10-3mm
C10-4mm
D10-5mm
E10-6mm
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Question 2261
jamb1982
If the refractive index of a medium is \(\sqrt{2}\), what is the critical angle?
A45o
B50o12'
C56o25'
D75o
E90o
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Question 2262
jamb1982
A rod of length 10cm is heated through 100oC and its final length is 10.26cm. What is the co-efficient of linear expansion of the rod?
A0.026 per degree centigrade
B0.00026 per degree centigrade
C0.26 per degree centigrade
D1.0026 per degree centigrade
E0.0026 per degree centigrade
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Question 2263
jamb1982
Why does a piece of cork float on water?
Athere is no upthrust on it when completely immersed in water
Bthe upthrust on it when completely immersed in water is greater than its weight in air
Cthe upthrust on it when completely immersed in water is less than its weight in air
Dits specific gravity is greater than that of water
Eits specific gravity is the same as that of water
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Question 2264
jamb1982
The combination of sound waves with different frequencies is known as
Ainterference
Bdiffraction
Csuperposition
Dforced vibration
Eresonance
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Question 2265
jamb1982
An object 15cm high is 30cm from pin-hole camera. If the height of the image formed at the back of the camera is 10cm, the image distance is
A20cm
B45cm
C54cm
D63cm
E70cm
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Question 2266
jamb1982
250g of lead at 170oC is dropped into 100g of water at 0oC. If the final temperature is 12oC, the specific heat of lead is (specific heat of water is 4,200J/kgoC)
A39.5J/kgoC
B50.4J/kgoC
C127.6J/kgoC
D154.6J/kgoC
E173.4J/kgoC
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Question 2267
jamb1982
Which of the following statements is NOT true? Thermostats are used to control the temperature of
Apressure cookers
Blaundry irons
Chot water storage tanks
Daquaria for tropical fish
Eheated apartments
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Question 2268
jamb1982
The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a
Apipette
Bburette
Cmeasuring cylinder
Ddensity bottle
Eeureka can
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Question 2269
jamb1982
Which of the following machines does NOT apply the lever principle?
Aclaw hammer
Bwheel barrow
Csingle moving pulley
Dsugartongs
Enutcrackers
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Question 2270
jamb1982
A mango fruit drops from a branch 10m above the ground, just before hitting the ground its velocity is (g = 10ms-2)
