11th Class Physics Chapter 1 MCQs
11th Class Physics Chapter 1 MCQs
Tick the correct option.
1) The mean diameter of a wire is found to be
$$(0.50\;\pm\;0.02)\;mm.$$
The percentage uncertainty in the diameter is:
A) 2 %
B) 4 %
C) 6 %
D) 8 %
Correct option is (b)
Explanation:-
$$Mean\;dimeter\;d=0.50\;mm\\Absolute\;uncertainty\;\bigtriangleup d=0.02\;mm\\Percentage\;uncertianty\;given\;by:\\Percentage\;uncertianty\;=\bigtriangleup d\;(d)\;\times100\\=\frac{0.02}{0.50}\;\times100=4\;\%$$
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2) A reaction takes place that is expected to yield 171.9 g of product, but it only yields 154.8 g. What is the percent error for this experiment?
A) 17.1 %
B) 90.1 %
C) 111.0 %
D) 9.9 %
Correct option is (d)
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3) Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of exactly 7.32 g for the mass of the standard. These results imply that the balance is:
A) both accurate and precise
B) neither accurate nor precise
C) accurate but not precise
D) precise but not accurate.
Correct option is (d)
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4) Dimension of universal gravitational constant (G) is:
$$A)\;\left[M^{-2}\;L^3\;T^{-2}\right]\\B)\;\left[M^3\;L^{-1}\;T^{-2}\right]\\C)\;\left[M^{-1}\;L^3\;T^{-2}\right]\\D)\;\left[M^{-3}\;L^3\;T^{-2}\right]$$
Correct option is (c)
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5) A measurement, which on, repetition gives same or nearly same result is called:
A) Accurate
B) average
C) precise
D) estimated
Correct option is (c)
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6) A student is measuring the time of an event by using stopwatch. He takes 5 measurements as: 3.0 s, 3.2 s, 3.4 s, 2.8 s, 3.1 s. What is the uncertainty in the result?
$$A)\;\pm\;0.3\;s\\B)\;\pm\;0.6\;s\\C)\;\pm3.1\;s\\D)\;\pm7.75\;s$$
Correct option is (a)
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7) Which of following quantity has a different dimension?
A) force
B) weight
C) modulus of elasticity
D) tension
Correct option is (c)
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8) If the dimensions of a physical quantity are given by
$$\left[L^a\;M^b\;T^{-c}\right],$$ then the physical quantity will be:
A) force, if a a = -1, b = 0, c = -2
B) pressure, if a = -1, b = 1, c = -2
C) velocity, if a = 1, b = 0, c = 1
D) acceleration, if a = 1, b = 1, c = -2
Correct option is (c)
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9) Order of magnitude of
$$(\;10^{6\;}+\;10^3\;)$$ is:
$$A)\;10^{18}\\B)\;10^9\\C)\;10^6\\D)\;10^3$$
Correct option is (c)
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10) Which of the following may be used as a valid formula to calculate the speed of ocean waves?
$$\lbrack v=speed.g=accelerationdue\;to\;the\;gravity,\\\lambda=wavelength,\rho=density,h=depth\rbrack.$$
$$A)\;v\;=\;\sqrt{\lambda g}\\B)\;v\;=\;\rho gh\\C)\;v\;=\;gh/\lambda\\D)\;v\;=\;\lambda gh$$
Correct option is (a)
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