Which of the following represent reasonable order-of-magnitude estimates for your age in seconds?
1. 10
9 s
2. 10
11 s
3. 10
7 s
4. 10
5 s
[Ques. 2] Which of these numbers is closest to the number of barbers in the US?
1.10,000
2.300 million
3.1000
4.200,000
[Ques. 3] Which of the following statements is correct?
1.If an equation is dimensionally correct it must be true and if it is not dimensionally correct it may be true.
2.If an equation is dimensionally correct it may be true and if an equation is not dimensionally correct it may be true.
3.If an equation is dimensionally correct it may be true and if it is not dimensionally correct then it cannot be true.
4.If an equation is dimensionally correct it must be true and if an equation is not dimensionally correct it cannot be true.
[Ques. 4] Suppose that two quantities, A and B, have different dimensions. Determine which of the following arithmetic operations could be physically meaningful.
(i) A + B
(ii) A/B
(iii) B - A
(iv) AB
1.(iv) only
2.(ii) only
3.(i) and (iii)
4.(ii) and (iv)
[Ques. 5] Which of the following expresses 72 102 g correctly using prefixes given?
[Ques. 6] Which of the following expresses 5.2 10-5 s correctly using the metric prefixes given?
[Ques. 7] Which of the following expresses 3 10-4 m correctly using the metric prefixes given?
[Ques. 8] Suppose that the three fundamental standards of the metric system were length, density, and time rather than length, mass, and time. The standard of density in this system is to be defined as that of water. Which of the following are among the considerations about water that you would need to address to make sure that the standard of density is as accurate as possible?
(i) That the amount of water is at some defined value.
(ii) That the pressure of the water is at some defined value.
(iii) That the temperature of the water is at some defined value.
(iv) That the water is pure.
1.(ii), (iii) and (iv)
2.(i) only
3.all four
4.(i), (ii), and (iii)
[Ques. 9] Which of the following would serve as the best time standard?
1.the rotation of Earth upon its axis
2.the vibration of a CS-133 atom
3.a grandfather clock
4.the buzzing of a mosquito
[Ques. 10] Which of the following wavelengths is common to a 10 cm tube open at both ends and a 15 cm tube open at one end and closed at the other?
1.60 cm
2.30 cm
3.20 cm
4.15 cm
5.5 cm
6.Two of the above
7.Three of the above
8.None of the above
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