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1 Which is not dimensionally correct?
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E=mc^2 -
Vf = Vi + at -
S = vt^2 -
S = 1/2 gt^2
Correct!Wrong!
S = vt^2
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2 The gravitational constant G has the SI unit:
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ms^-2 -
Nm^2 kg^-2 -
m^3 kg^-1 s^-2 -
None of these
Correct!Wrong!
Nm^2 kg^-2
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3 The dimensions of angular frequency are the same as that of :
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Angle
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Angle/frequency
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Frequency
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Time Period
Correct!Wrong!Frequency
Angular frequency and frequency have same dimensions i.e. [T^-1]
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4 Which of the following has the same dimensions;
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Pressure, Density
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Impulse, Momentum
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Stress, Strain
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Momentum, Inertia
Correct!Wrong!Impulse, Momentum
As impulse = Change in momentum
which means that both have same units and dimensions.
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5 Time taken by light to reach from moon to earth is :
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1 min 10 sec
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1 min 20 sec
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1 min 40 sec
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1 min 45 sec
Correct!Wrong!1 min 20 sec
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6 In color printing the whole range of colors is obtained by mixing ;
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Four colors
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Five colors
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Six colors
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Seven colors
Correct!Wrong!Four colors
Cyan, Magenta, Yellow and Black (CYMK)
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7 A precise measurement is one which has ;
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Less precision
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Greater precision
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Less absolute Uncertainty
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Both B & C
Correct!Wrong!Both B & C
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8 Zeros to the left of significant figures ;
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Are Not Significant
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May or may not Significant
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Are Significant
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None of these
Correct!Wrong!Are not Significant
Zeros to the left of significant figures are not significant.
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9 The supplementary units are;
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Radian
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Steradian
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Both A & B
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None of these
Correct!Wrong!Both A & B
Supplementary units are the dimensionless units that are used along with the base units to form derived units in the International system. The class of supplementary contains only two purely geometrical units, that is the radian and the steradian.
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10 Computer chips are made up of ;
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Copper
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Silicon
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Iron
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Cadmium
Correct!Wrong!Silicon
Computer chips are made of silicon, which is a semiconductor element (material) belongs to 4th group of periodic table.
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PHYSICS XI Ch#1 Quiz 3
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