Kognity IB Physics A.0 Measurements & Uncertainty - 无忧得胜-网上国际课程 (5edu.win)

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1#

单选题 ( 1.0 分) (组内1/10) 切至整卷模式搜藏此题

第 1 题组 (共 10 题 10 分)

Which of the following could be r7daq*rqe7 6w dzht +3a unit of power?

A. $kg \cdot m \cdot s^{-2}$

B. $kg \cdot m^2 \cdot s^{-1}$

C. $kg \cdot m^2 \cdot s^{-2}$

D. $kg \cdot m^2 \cdot s^{-3}$

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2#

单选题 ( 1.0 分) (组内2/10) 切至整卷模式搜藏此题

By approximately how many powers of ten i *djv ed, -x :o:./uxn1axhdfzs the height of a human larger than the height of a grain o*dd- o:nvu1 a:jh .f x/d,xxzef sand?

A. -3

B. 2

C. 3

D. 1000

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3#

单选题 ( 1.0 分) (组内3/10) 切至整卷模式搜藏此题

What is the value of )v *l37eow3t+npzfr v$\frac{6.3 \mu \mathrm{m} \times 10 \mathrm{GN}}{2.1 \mathrm{~ms}} ?$

A. $30$

B. $30 \; W$

C. $3 \times 10^7$

D. $3 \times 10^7 \; W$

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4#

单选题 ( 1.0 分) (组内4/10) 切至整卷模式搜藏此题

Which of the following is a fundamenta;ea1yum1tgpalkzk+++ hmf kwm:z 70219ol c cl unit in the SI system?

A. kevin

B. volt

C. coulomb

D. joule

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5#

单选题 ( 1.0 分) (组内5/10) 切至整卷模式搜藏此题

The volume of the Earth is apptmzos4t4.i,lo8 k i-oroximately $10^{12} \mathrm{~km}^3$ and the volume of a grain of sand is approximately $1 \mathrm{~mm}^3$. To the nearest order of magnitude, if the Earth was hollow, how many grains of sand could it contain?

A. $10^{12}$

B. $10^{18}$

C. $10^{24}$

D. $10^{30}$

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6#

单选题 ( 1.0 分) (组内6/10) 切至整卷模式搜藏此题

A farmer in Tanzania has an average life expectancy of 62 years. Which of the following is an estimate of his lifetime in seconds?

A. $10^5$

B. $10^7$

C. $10^9$

D. $10^{11}$

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7#

单选题 ( 1.0 分) (组内7/10) 切至整卷模式搜藏此题

Estimate, to the nearest order of magnitude, the number of heartba5ij uaw lhw;f1:da8 q) kw56peats of an average adult human i15hukw ij 5lwaq :fw6 8a;d)pan a day.

A. $10^4$

B. $10^5$

C. $10^6$

D. $10^7$

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8#

单选题 ( 1.0 分) (组内8/10) 切至整卷模式搜藏此题

Which of the following contains one fundamental unit axsn c36n op)i3+*k h gvtz)rg-nd one derived unit?

A. volt, kelvin

B. metre, second

C. ampere, kelvin

D. coulomb, newton

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9#

单选题 ( 1.0 分) (组内9/10) 切至整卷模式搜藏此题

If A=10.0 and B=0.50, which calculation will give the answer with the mobqm h:w4a-n6wd+)emv st decim6ew+ vh)bq4mmd:-awnal places?

A. $A \times B$

B. $A/B$

C. $A^2$

D. $B^2$

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10#

单选题 ( 1.0 分) (组内10/10) 切至整卷模式搜藏此题

A car has a mass of 1000kg. A mouse has a mass of 10g. What is the order ;,xafyt zm :b/of magnitude of the ratxbm a,ftyz/; :io between the mass of the car to that of the mouse?

A. -5

B. 5

C. $10^{-5}$

D. 100000

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11#

填空题 ( 1.0 分) (组内1/29) 切至整卷模式搜藏此题

第 2 题组 (共 29 题 29 分)

A train travels $83.4 \pm 0.8$ meters in $10.387 \pm 0.05$ seconds. What is the absolute uncertainty in its speed? (数值) (Leave your answer to two significant figures, without units and without the $\pm$ symbol.)

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12#

填空题 ( 1.0 分) (组内2/29) 切至整卷模式搜藏此题

A water tank is the shape of a cube with six 0-x9elha jtw:,2ncndes of $5.11 \mathrm{~m}$. Each side is measured with an uncertainty of $1.0 \%$. What is the absolute uncertainty in the volume of the tank? (数值) (Give your answer without a unit and to 2 significant figures)

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13#

填空题 ( 1.0 分) (组内3/29) 切至整卷模式搜藏此题

A pyramid has a square l wy:m +i19ga u3ak/nf63qfm sbase of side $x$ and height $h$. The volume $V$ of the pyramid is given by the expression:
$$V=\frac{x^2 h}{3}$$
If $V$ is measured to $3.2 \%$ and $h$ is measured to $2 \%$, what is the percentage uncertainty of $x ?$ (数值) % (Remember to exclude the $\%$ symbol with your answer)

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14#

单选题 ( 1.0 分) (组内4/29) 切至整卷模式搜藏此题

The length of a pencil is measured using part of a metre rule that i ;khd xnz2xvh+(aeabl-;: v:u s graduated in millimetres, as shown + vk d;:; xa :v2lbz(hena-uhxbelow.

What is the length of the pencil?

A. $(6.00 \pm 0.10) \; cm$

B. $(6 \pm 0.1) \; cm$

C. $(6 \pm 0.05) \; cm$

D. $(6.00 \pm 0.05) \; cm$

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15#

填空题 ( 1.0 分) (组内5/29) 切至整卷模式搜藏此题

The volume $V$ of a cone of height $h$ and radius $r$ is given by the expression:
$$V=\frac{\pi r^2 h}{3}$$
In a particular experiment, there is a $5.5 \% $ uncertainty in $V$ and a $3.3 \%$ uncertainty in $r$. What is the percentage uncertainty in $h$ ? (数值) % (Remember to exclude the $\%$ symbol with your answer)

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16#

填空题 ( 1.0 分) (组内6/29) 切至整卷模式搜藏此题

The radius of a balloon is measured*2b)f phq2cjc g8 2kwd to be $21.4 \pm 1.0 \; cm$. What is the percentage uncertainty in the calculated volume of the balloon? (数值) % (Remember to keep three significant figures and exclude the $\%$ symbol with your answer and treat the balloon as a sphere)

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17#

填空题 ( 1.0 分) (组内7/29) 切至整卷模式搜藏此题

The period $T$ of oscillation of a pendulum of length $l$ is given by:
$$T=2 \pi \sqrt{\frac{l}{g}} .$$
If the uncertainty in $g$ is $2.0 \%$ and the uncertainty in $l$ is $2.0 \%$, what is the percentage uncertainty in $T$ ? (数值) % (only fill in numerical value without the % sign and keep two significant figures)

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18#

填空题 ( 1.0 分) (组内8/29) 切至整卷模式搜藏此题

The lengths of the sides oftqv ht)18xu30 pi+(igv*wos akavy 4. a room are estimated as $10.0 \mathrm{~m}, 4.0 \mathrm{~m}$ and $3.0 \mathrm{~m}$, each with an uncertainty of $\pm 6 \%$. What is the absolute uncertainty in the volume of the room? (数值) $m^3$ (Give your answer in $\mathrm{m}^3$ to two significant figures, without a unit.)

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19#

填空题 ( 1.0 分) (组内9/29) 切至整卷模式搜藏此题

The potential differenceicn28 /1r7ue occv- ud ($V$) across a resistor is measured with a digital voltmeter to be $0.78 \; V$ . What is the percentage uncertainty in $V^2$ ? (数值) % (only put numerical values in the blank and keep two significant figures.)

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20#

单选题 ( 1.0 分) (组内10/29) 切至整卷模式搜藏此题

By averaging three meas5piywhk.u (gmop4k)5t r o +x2urements of the same quantity which of the following can be reducermt4ip5)+ p k2xo(.woguy 5kh d?

A. Random errors

B. Systematic errors

C. Random & systematic errors

D. Zero errors

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21#

单选题 ( 1.0 分) (组内11/29) 切至整卷模式搜藏此题

A student measures a distance f8fzo wi5x0p5 bour times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. zxb58f5piw o0 What is the best estimate of this measurement?

A. $37.8 \pm 0.2 \; cm$

B. $37.8 \pm 0.4 \; cm$

C. $38.0 \pm 0.2 \; cm$

D. $38.2 \pm 0.4 \; cm$

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22#

单选题 ( 1.0 分) (组内12/29) 切至整卷模式搜藏此题

A student measures two lengths as follows: f/,5sr3zbsv) h tx1df$$a = (10 \pm 0.1) \; cm$$ $$b = (20 \pm 0.1) \; cm$$
Which of the following quantities has the largest percentage uncertainty?

A. $a$

B. $b$

C. $a+b$

D. $a-b$

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23#

单选题 ( 1.0 分) (组内13/29) 切至整卷模式搜藏此题

The time for two event nkk1zy3t1r 6,2udxtncjk( x7s, a and b, are measured to be $(5.1 \pm 0.1)s$ and $(4.9 \pm 0.1)s$ respectively. In which of the following quantities is the fractional(percent) uncertainty the smallest?

A. $a+b$

B. $a-b$

C. $a \times b$

D. $a/b$

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24#

单选题 ( 1.0 分) (组内14/29) 切至整卷模式搜藏此题

The variation of quantity P as quantity Q varies inkn2 :rh , 0f3eg6ozpcs plotted. Theory states that P should vary linearlyk2,z03 freh:pncog 6n with Q.

A. The systematic errors are substantial.

B. The random errors are substantial.

C. The random errors and the systematic errors are insignificant.

D. The random errors and the systematic errors are substantial.

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25#

单选题 ( 1.0 分) (组内15/29) 切至整卷模式搜藏此题

The length of a pencil is measured using part of a measuring tap0c kc7bw2 qg orutk*uz,2w15ie as shown below.0buz* 1,o2cwr k2tiwk5g7 quc

What is the length of the pencil?

A. $4.5 \pm 0.1 \; cm$

B. $11.5 \pm 0.2 \; cm$

C. $11.5 \pm 0.3 \; cm$

D. $11.5 \pm 0.5 \; cm$

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26#

单选题 ( 1.0 分) (组内16/29) 切至整卷模式搜藏此题

The masses and weights of different objects bul,op *8k 6rsc7-rd)r0 q9g vq.fdq af0brn-are independently measured. The graph is a plot of weight versus mask8b f- ud 7 *,)r .sornlrcq-9g0b 0rp6dvfqqas that includes error bars.

What do these experimental results suggest?

A. The weight of an object is inversely proportional to its mass.

B. The measurements show a significant random error but small systematic error.

C. The measurements show a significant systematic error but small random error.

D. There is no correlation between the weights and the masses of the objects.

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27#

单选题 ( 1.0 分) (组内17/29) 切至整卷模式搜藏此题

The resistance $R$, and cross-sectional area $A$, of equal lengths of wire are measured at constant temperature and a graph of $R$ against $\frac{1}{A}$ is plotted. Which one of the following graphs would be obtained if $R$ is directly proportional to $\frac{1}{A}$ and if there is a significant systematic error in the measurement of $R ?$

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28#

填空题 ( 1.0 分) (组内18/29) 切至整卷模式搜藏此题

The lengths of the sides of a rectangular plate are measured, and the d ft8ut6xw5 wm vn33*xsiagram show wm5x*sv8w6tnxt 33fu s the measured values with their uncertainties.

What is the percentage error in the area of the plate? %. (Remember to exclude the % symbol with your answer.)

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29#

填空题 ( 1.0 分) (组内19/29) 切至整卷模式搜藏此题

The density of a solid spherdn0av3ml l3s(1e+geke is measured with percentage uncertainty of 7%. The radius of the spheresk0(da l+m3ve3ge1nl is 5.2 ± 0.4 cm. What is the percentage uncertainty in the mass of the sphere? (数值) % (Please do not include the % simbol in the blank)

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30#

单选题 ( 1.0 分) (组内20/29) 切至整卷模式搜藏此题

Experimental data has shown that:i2- ozj ghvkf/z+m(-swzs+0 h
$$
P=\frac{g h^2}{u^3}
$$
where $g$ is a constant. If the percentage uncertainties in $h$ and $u$ are $a$ and $b$ respectively, what is the percentage uncertainty in $P ?$

A. $2a + 3b$

B. $2a - 3b$

C. $(2a/3b)$

D. $a^2/b^3$

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31#

单选题 ( 1.0 分) (组内21/29) 切至整卷模式搜藏此题

An experiment used to measure the acceleration due to gravity produces 9y2nu( cg5lg(y1jvup the following rl p(vy2u9j5gcg 1n uy(esults:
$\begin{array}{llllllllll}7.83 & 6.98 & 7.52 & 8.01 & 7.76 & 7.15 & 6.87 & 7.25 & 8.35 & 7.54\end{array}$
Which of the following statements is true about these data?
Are there random or systematic errors, both, or neither?
(Acceleration due to gravity, $g$, on Earth is usually taken as $9.81 \mathrm{~m} \mathrm{~s}^{-2}$ ).

A. There is a large random error, but no systematic error.

B. There is a large systematic error, but a small random error.

C. There are large random and systematic errors.

D. There is a small random error and no systematic error.

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32#

填空题 ( 1.0 分) (组内22/29) 切至整卷模式搜藏此题

A rectangle was drawn using a ruler, such that each1v+rd wb:p k7mq;l2odlib):b measurement has an uncertain) dwol+r; pik1mqvbld2:: 7bb ty of $0.5 \mathrm{~cm} .$

What is the absolute uncertainty in the area of the entire rectangle (i.e. combined small and big rectangles), in $\mathrm{cm}^2$ ? $cm^2$ (Do not write units with the answer. Give your answer to 2 significant figures.)

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33#

填空题 ( 1.0 分) (组内23/29) 切至整卷模式搜藏此题

For an object of mass vy4s*+; hbmby0ylaqax* q03 z$(2.0 \pm 0.1) \mathrm{kg}$, what percentage uncertainty in the velocity will give a $6.3 \%$ uncertainty in the kinetic energy ($KE = \frac{1}{2}mv^2$) ? (数值) % (do not include the percent sign in your final result)

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34#

单选题 ( 1.0 分) (组内24/29) 切至整卷模式搜藏此题

An ammeter has a non-negligible zero offset error. Which of e6tchykw /2q7 d/swtao 8de9:the following statements is correctyd k/:o976sd 8hea 2/ qcttwwe?

A. The readings from the ammeter will be accurate but not precise.

B. The readings from the ammeter will be neither accurate nor precise.

C. The readings from the ammeter will be precise and accurate.

D. The readings from the ammeter will be precise but not accurate.

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35#

填空题 ( 1.0 分) (组内25/29) 切至整卷模式搜藏此题

A student measures a lengt(ujg 5b8z4 tivh five times. All of the measurements lie between $18.8 \mathrm{~cm}$ and $19.2 \mathrm{~cm}$. What should the student quote as the absolute uncertainty in the length? The absolute uncertainty is $cm$ (Do not include the $\pm$ symbol nor the unit)

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36#

单选题 ( 1.0 分) (组内26/29) 切至整卷模式搜藏此题

A piece of string 9.5 ± 0.1 cm long is cut from a longer piece that is 12.6 ± 0 q5d.)dyqxbyb08ivv7 /p d3zf.8 cm long. How long is the remaining piece of strinid7qbdz xvfv8 y 03d5/qp)b.yg?

A. $3.1 \pm 0.1 \; cm$

B. $3.1 \pm 0.9 \; cm$

C. $3.1 \pm 0.9 \; cm$

D. $3.1 \pm 1.0 \; cm$

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37#

填空题 ( 1.0 分) (组内27/29) 切至整卷模式搜藏此题

A current of value $I$ flows through a resistor of resistance $R$ and the power dissipated is $I^2 R$. The value of $I$ has an uncertainty of $\pm 1 \%$ and the value of $R$ has an uncertainty of $\pm 8 \%$. What is the percentage uncertainty in the calculated power dissipation? (数值) % (Give your answer correct to two significant figures without the % sign.)

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38#

填空题 ( 1.0 分) (组内28/29) 切至整卷模式搜藏此题

A force of 10.0 ± 0.5 N is applied to a mass of 2.0 ± 0.25 kg, causin3z u4)uso4 icilq4.jgv(ki,og it to accelerate. What is the percentage uncertainty of its .g4s)3j4c uoivii4ouz ,ql (k acceleration? (数值) % (do not include the percent sign in your result)

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39#

填空题 ( 1.0 分) (组内29/29) 切至整卷模式搜藏此题

The radius of a circle of wire is measuredmpdjf8vtq f2o*f b/iemxe/t q;*)7 3s to be 10.0 ± 0.5 cm.
What is the percentage error in the area of the loop? (数值) %
What is the percentage error in the circumference of the loop? (数值) %

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