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 a unit ofl sqdkf xrh58uw.0u0xqf ef6 0o8d/ -u 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 is the height of a human large2s :hcd;jq rznu o,(i-r than the heigznhc2o:jqrs - , u(id;ht of a grain of 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 ofnt97zyo5 *7fpl 8.,ahk0eme(gd jbj n 5zj8ut $\frac{6.3 \mu \mathrm{m} \times 10 \mathrm{GN}}{2.1 \mathrm{~ms}} ?$

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 fundam+.:8astdv bd iental 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 approximatekc(u0 k*ho)ww ly $10^{12} \mathrm{~km}^3$ 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 +;jg8pl28wttv 5m cn lp 0 nd9c;vf:wgof magnitude, the number of heartbeats of an average adult vg wj;mtdlc+5n29gf ;:ct88l0 v pnwp human in 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 andyrz+15:ubm;.jf fi m a 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 th+p (lgu 83tpnwe answer with the most decimal pla+gl 8uwp( npt3ces?

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 l:+no ,uxpgt9 is the order of magnitude of the ratio between the mass of the car to, tgpu+l x9no: 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 $64.1 \pm 0.3$ meters in $5.177 \pm 0.04$ 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 sha/; mkl88gjbt gpe of a cube with sides of $2.31 \mathrm{~m}$. Each side is measured with an uncertainty of $2.3 \%$. 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 base of sif 28qqcp*e;e, qk;s;lwf4puo sl8kh;de $x$ 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 $7.1 \%$ and $h$ is measured to $6 \%$, 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 partx3e lz9hv. q4l+xa 4ve of a metre rule that is graduated in millimetres, as shown b3.ql xv+zhx9l 44eeavelow.

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 $3.7 \% $ uncertainty in $V$ and a $2.6 \%$ 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 mer80i cvy6oo yc)s*apo5mm +2nasured to be $20.0 \pm 1.1 \; cm$. 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 $1.6 \%$ and the uncertainty in $l$ is $3.5 \%$, 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 of a room are esti+e;l 2/ 7ghtr0jek nlnmated as $10.0 \mathrm{~m}, 4.0 \mathrm{~m}$ and $3.0 \mathrm{~m}$, each with an uncertainty of $\pm 10 \%$. 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 difference zyzegi++oh /,i- 4. b ,tytggq9 yo9r/p 0isul($V$) across a resistor is measured with a digital voltmeter to be $0.45 \; V$ . 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 measurements of the same quantity which op;wa5x+mu i(sq 9wa8 tf the following can be reduced u;+wa9pa8xq( 5ws itm?

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 four times. )a:rjd)7 vk ola6agf1 The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of vj1 fa rk7ld)og:6a)athis 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 ipkyq3 ma/(e3 as follows: $$a = (10 \pm 0.1) \; cm$$ $$b = (20 \pm 0.1) \; cm$$
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 eveidcd:p 0nmu-jldb7-4 nts, 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 qlowo)pyh z s gf/ //z( lphn)41b9geu7uantity Q varies is plotted. Theory states that P should vary linearly wil nphlzyzo)7)p/h/s o9ewb(/1 gg u f4th 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 ofbok cv9s * :ifey2l4(c a measuring tape as shown below*924 ck(sy f:c leiobv.

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 diffevugj sofm6+ 1:rent objects are independently measured. The graph is a plot ofm+v:o jsg u16f weight versus mass 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 measure7kde)1:y-unfbk o h: dd, and the diagram shows the mk dh-fk1 :yd: ou7be)neasured 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 soli2lw(di6k d9y atv1 b/kh( 8ngq,xml6kd sphere is measured with percentage uncertainty of 4%. The radius (hd 8,iy9v6mlqk/n ab wd1x6kgt(kl2 of the sphere is 6.0 ± 0.1 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 t 0f+n(sizvc89ewg r(m5l q f4shat:
$$
P=\frac{g h^2}{u^3}
$$
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 pr ;9yexnqv/dzbsj) 2a/g9,whe oduces the following gh/)a z29b,/sndeqv9;wje yxresults:
$\begin{array}{llllllllll}7.83 & 6.98 & 7.52 & 8.01 & 7.76 & 7.15 & 6.87 & 7.25 & 8.35 & 7.54\end{array}$
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 each measureme3n06 ds(e0 e++jth4 uark ourcnt has an uncertainty oue3 de(c+a+j4trrk06u nso h0f $0.5 \mathrm{~cm} .$

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 pn( gk2miq.y) vtk,f ,zo+e ,m$(2.0 \pm 0.1) \mathrm{kg}$, 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-negf,7 ;plj .p.:rregnw.eq u-hsligible zero offset error. Which of the following statemhq;j.puf ,re ge..-r7:w nslp ents is correct?

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 length five times. All of the measurements lie betify,xdl7jmi 0(, op te (5)fkuween $18.8 \mathrm{~cm}$ 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 5g8tl qmvrv;vxub1m-3yg)pq r0 7n .qqc 6e4m± 0.5 cm long is cut from a longer piece that is 12.6 ± 0.g7r1tg v)65yl4v 8ueqqv-0b qm ;cxpmqnmr 3.2 cm long. How long is the remaining piece of string?

A. $3.1 \pm 0.5 \; cm$

B. $3.1 \pm 0.3 \; cm$

C. $3.1 \pm 0.7 \; cm$

D. $3.1 \pm 0.8 \; cm$

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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 $\pm 2 \%$ and the value of $R$ has an uncertainty of $\pm 3 \%$. 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 appwvnng k57tp, k(-o (vmlied to a mass of 2.0 ± 0.12 kg, causing it to accelerate. What is the percenk twm - (v5n(7kpvo,ngtage uncertainty of its 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 mg )cg e4+p r/43ldxgf9ml)cigfo,xm(,ds pe :easured to be 10.0 ± 1.7 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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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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