Objective Questions L denotes answer available in studentsolutions Monuawstudy G
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Objective Questions L denotes answer available in studentsolutions Monuawstudy Guide 1. One student uses a meterstick to measure the thick ness of a textbook and obtains 4.3 cm 0.1 cm. Other students measure the thickness with vernier calipers 6. What is the sum of the measured values 21.4 s 15 s obtain different measurements: (a) 4.32 cm 17.17 s 4.00 3 s? t 0.01 cm, (b) 4.31 cm t 0.01 cm. (c) 4.24 cm t 0.01 cm, (d) 58 s (e) 60 s and (d) 4.43 cm 0.01 cm. Which of these four mea surements, if any, agree with that obtained by the first 7. Which of the following is the best estimate for the mass of all the people living on the Earth? (a) 2 x 105 kg student? 2. A house is advertised as having 420 square feet under (e) 4 x 1012 kg its roof. What is its area in square meters (a) 4 660 m (b) 432 m (c) 158 m2 (d) 132 m2 (e) 40.2 m2 8. (a) If an equation is dimensionally correct, does that mean that the equation must be true? (b) If an equa 3. Answer each question yes or no. Must two quantities tion is not dimensionally correct, does that mean that have the same dimensions (a) if you are adding them? the equation cannot be true? (b) If you are multiplying them? (c) If you are subtract ing them? (d) If you are dividing them? (e) If you are 9. Newton's second law of motion (Chapter 5) says that the mass of an object times its acceleration is equal to the equating them? net force on the object. Which of the following gives 4. The price of gasoline at a particular station is 1.5 euros the correct units for force? (a) per liter. An American student can use 33 euros to buy (c) kg/ s (d) kg mz/s (e) none of those answers gasoline. Knowing that 4 quarts make a gallon and that 10. A calculator Hisplays a result as 1.365 248 0 x 107 kg. 1 liter is close to 1 quart, she quickly reasons that she The estimated uncertainty in the result is t2%. How can buy how many gallons of gasoline? (a) less than many digits should be included as significant when the i gallon (b) about 5 gallons (c) about 8 gallons (d) more result is written down? (a) zero (b) one (c) two (d) thre than 10 gallons (e) four Rank the following five quantities in order from the largest to the smallest. If two of the quan es are equaExplanation / Answer
Answer for Problem Number 3:
When we will add or subtract or equate the quantities must have same dimension where as it is not necessary for multiplication and division.
a) Yes
b) not required
c) yes
d) not required
e) yes
Answer for Problem no: 7
The average weight of a male person is about 70 kg and for a female is about 61 kg. As per World population survey, the total population is 6.50 billion.
The average weight of a person, combining male and female, is 65 kg.
The total weight = average weight*population
= 65*6.5*10^9 kg = 422*10^9 kg = 4.22*10^11 kg
This weight will best fit for 3*10^11 kg.
So answer is d.
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