It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus?
Aan electron
Ba \(\beta\)-particle
Can \(\alpha\)-particle
Da proton
Ean atom
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Question 1202
jamb1979
A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is?
Aa little above half of its initial energy
Ba little below half of its initial energy
Ca half of its initial energy
Da little above its initial energy
Ea little below its initial energy
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Question 1203
jamb1979
On which of the following is the operation of a moving coil galvanometer based?
AMagnetic effect of electric current
BElectromagnetic induction
CChemical reaction produced by electricity
DForce on current carrying conductor in a magnetic field
EElectrical energy and power
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Question 1204
jamb1979
The speed of light in air is 3 x 108ms-1. If the refractive index of light from air-to-water is \(\frac{4}{3}\), then which of the following is the correct value of the speed of light in water?
A4 x 108ms-1
B2.25 x 108ms-1
C\(\frac{4}{9}\) x 108ms-1
D2.25 x 102ms-1
E4.33 x 108ms-1
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Question 1205
jamb1979
All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
A120J
B60Jg-1
C120Jg-1
D1500J
E1500Jg-1
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Question 1206
jamb1979
Which of the following electromagnetic waves has the shortest wavelength?
ARadio waves
BX-rays
CInfra-red
DBlue light
EUltraviolet
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Question 1207
jamb1979
An air bubble rises from the bottom to the top of a water dam which is 40m deep. The volume of the bubble just below the surface is 2.5cm3. Find its volume at the bottom of the dam, if atmospheric pressure is equivalent to 10m water
A0.0cm3
B2.0cm3
C1.6cm3
D0.625cm3
E0.5cm3
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Question 1208
jamb1979
Which of the following statements is true? The frequency of a vibrating string is
Aproportional to its length
Binversely proportional to the tension within it
Cproportional to the aptitude of vibration
Dinversely proportional to its cross-section
Eproportional to the square root of the tension within it
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Question 1209
jamb1979
A capacitor and a resistor are connected in series with each other and in series with an accumulator of negligible internal resistance. The potential across the terminals of the capacitor is
Atwice the e.m.f of the accumulator
Bless than the e.m.f by the potential drop across the resistor
Czero
Dthe same as the e.m.f.
Egreater than the e.m.f
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Question 1210
jamb1979
Consider a thick glass tumbler and a thin glass tumbler which are made of the same kind of glass. Some hot liquid is poured into them. Which of the following statements is correct?
Athe thick tumbler is less likely to crack because it is stronger
Bthe thick tumbler is less likely to crack because it insulates the heat beter, glass being a poor conductor of heat
CBoth tumblers are equally likely to crack because they are made of the same kind of glass
Dthe thick tumbler is more likely to crack because uneven expansion persists for a longer time within the thicker glass
Ethe thick tumbler is more likely to crack because it is heavier
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Question 1211
jamb1979
Which of the following statements about radioactivity are true? i. alpha particle is positively charged ii. Beta particle is negatively charged iii. Gamma ray is neutral iv. Beta particle has the same mass as helium atom v. Gamma ray is charged
Ai, ii, iii and iv only
Biv and v only
Ci, ii and iii only
Di, ii and v only
Eall
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Question 1212
jamb1979
In an electrolysis experiment, a cathode of mass 5g is found o weigh 5.01g after a current of 5A flows for 50 seconds. What is the electrochemical equivalent of the deposited substance?
A0.00004g/C
B0.00002g/C
C0.02500g/C
D0.05000g/C
E0.00001g/C
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Question 1213
jamb1979
The bulb of a motorcycle head-lamp is marked 40W, 6V. The resistance of the filament when it is switched on is
A\(\frac{6^2}{40^2}\)ohms
B\(\frac{40}{6^2}\)ohms
C\(\frac{40}{6}\)ohms
D6 x 40 ohms
E\(\frac{6^2}{40}\)ohms
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Question 1214
jamb1979
Which of the following is the correct definition of 'half-life'?
Athe average life-time of a radioactive material
Bthe time it takes a radioactive material to decay to half of its original quantity
Chalf the period a radioactive material decays completely
Dhalf of the decay constant
Ethe decay constant times life-time
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Question 1215
jamb1979
An electric cell has an internal resistance of 2 ohms. A current of 0.5A is found to flow when a resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?
A5 volts
B3.5 volts
C2.5 volts
D1 volts
E10 volts
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Question 1216
jamb1979
Which of the following statements is correct? The magnetized state of an iron bar can be destroyed completely by
Aheating the bar to a high temperature
Bbreaking the bar
Cconnecting opposite poles with a small piece of iron
Dplacing the bar inside a strong magnetic field
Enone of the above
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Question 1217
jamb1979
What are the units of thermal conductivity?
Akg.m.sec2
BJoule sec-1m-1k-1
Ckg.m
DNewton sec-1m2
Em3
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Question 1218
jamb1979
Which of the following statements is correct? The reading of pressure on a mercury barometer is independent of
Athe cross-sectional area of the tube
Bthe atmospheric pressure
Cthe density of mercury
Dthe temperature of mercury
Ethe acceleration due to gravity
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Question 1219
jamb1979
A landlord has eight 40W electric light bulbs, four 60W bulbs and two 100W bulb in his house. If he has all the points on for five hours daily and if N.E.P.A. charges 5k per unit, his bill for 30 days is
AN5.70
BN7.23
CN3.65
DN8.05
EN4.50
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Question 1220
jamb1979
Which of the following statements is incorrect? The sensitivity of a galvanometer which incorporates an optical lever arrangement may be increased by providing
Aa larger number of turns in the coil
Ba thinner suspension with a small torsional control
Ca special alloy permanent magnet which gives a high magnetic flux
