A particle moves in a circular orbit of radius 0.02m. If the speed of the particle is 0.88ms-1, calculate its frequency in cycles per second
A2.0Hz
B7.0Hz
C8.8Hz
D14.0Hz
E17.6Hz
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Question 1092
jamb1984
Which of the following statements describes an atom accurately? i. atoms of all elements are identical ii. an atom contains a nucleus and number of electrons iii. due to the electrons in the atom an atom is negatively charged iv. electrons in the atom move in circular orbits round the nucleus
Ai and ii
Bii and iii
Ciii and iv
Dii and iv only
Ei,ii and iii
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Question 1093
jamb1984
A small steel needle is carefully floated on water in a beaker. When a few drops of kerosine are introduced into the water the needle sink. Which of the following statements correctly explain(s) the observation? i. there is tension on the water surface ii. kerosine reduces the density of water so that needle becomes denser than water iii. kerosine reduces the surface tension of water
Ai only
Bii only
Ciii only
Di and ii
Ei and iii
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Question 1094
jamb1984
A body of mass 5kg initially at rest is acted upon by two mutually perpendicular forces 12N and 5N as shown in fig.3. If the particle moves in the direction QA, calculate the magnitude of the acceleration
A0.40ms-2
B1.40ms-2
C0.26ms-2
D2.60ms-2
E3.40ms-2
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Question 1095
jamb1984
A plane inclined at an angle of 30o to the horizontal has an efficiency of 60%. The force parallel to the plane required to push a load of 120N uniformly up the plane is
A60N
B100N
C120N
D200N
E240N
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Question 1096
jamb1984
If a solid changes directly into a gas when heat is applied the process is called
Avaporization
Bevaporation
Csublimation
Dionization
Econversion
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Question 1097
jamb1984
The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?
A55.3oC
B23.3oC
C49.0oC
D16.1oC
E76.7oC
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Question 1098
jamb1984
Dewpoint is the temperature at which, water vapour in the atmosphere
Aturns into steam
Bsolidifies into ice pellets
Cfirst condenses into liquid form
Dis just sufficient to cause cooling
Ehas a relative humidity of fifty percent
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Question 1099
jamb1984
One of two identical tuning forks with natural frequency 256Hz, one is loaded so that 4 beats per second are heard when they are sounded together. What is the frequency of the loaded tuning fork?
A260Hz
B252Hz
C248Hz
D264Hz
E258Hz
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Question 1100
jamb1984
Which of the following statements is (are) NOT correct? i. pressure changes do not affect the speed of sound in air ii. the velocity of sound increases with temperature iii. the quality of the note depends only on its frequency
Ai only
Bii only
Ciii only
Di and iii
Eii and iii
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Question 1101
jamb1984
When vibration occurs in air column, the distance between a node and an antinode is equal to
Aone-quarter of the wavelength
Bone-hall of the wavelength
Cthe wave length
Dtwice the wavelength
Efour-times the wavelength
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Question 1102
jamb1984
All the heat generated in a 5\(\Omega\) 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 1103
jamb1984
Which of the following can be described as high tension transmission?
Ahigh resistance and low voltage
Blow current and high voltage
Chigh current and low voltage
Dhigh voltage and zero current
Ehigh current and low resistance
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Question 1104
jamb1984
Which of the following components is NOT contained in a dry cell? A
Acarbon rod
Bpaste of magnesium dioxide
Cpaste of ammonium chloride
Dzinc case
Ecopper rod
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Question 1105
jamb1984
Two cells each of e.m.f. 1.5V and an internal resistance 2\(\Omega\) are connected in parallel. Calculate the current flowing when the cells are connected to a 1\(\Omega\) resistor
A0.75\(\Omega\)
B1.5\(\Omega\)
C0.5\(\Omega\)
D1.0\(\Omega\)
E0.6\(\Omega\)
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Question 1106
jamb1984
The resistance of a wire depends on
Athe length of the wire
Bthe diameter of the wire
Cthe temperature of the wire
Dthe resistivity of the wire
Eall of the above
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Question 1107
jamb1984
The unit of quantity of electricity is called
Athe ampere
Bthe volts
Cthe coulomb
Dthe ammeter
Eelectromotive force
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Question 1108
jamb1984
For a concave mirror to form a teal diminished image, the object must be placed
Abehind the mirror
Bbetween the mirror and its focus
Cbetween the focus and the centre of curvature
Dat the centre of curvature
Eat a distance greater than the radius of curvature
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Question 1109
jamb1984
For correcting long sight defects in the human eye we require a
Aconverging lens
Bdiverging lens
Cmicroscope
Dperiscope
Eplain glass sheet
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Question 1110
jamb1984
What volume of alcohol with a density of 8.4 x 102kgm-3 will have the same mass as 4.2m3of petrol whose density is 7.2 x 102kgm-3?
