# The Sun’s angular diameter is measured to be 1920′′. The distance D of the Sun from the Earth is  The diameter of the Sun: 1.   2.  3.  4.

Subtopic:  Measurement & Measuring Devices |
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If the size of a nucleus (in the range of ) is scaled up to the tip of a sharp pin, what roughly is the size of an atom? Assume tip of the pin to be in the range

1.

2.

3.

4.

Subtopic:  Measurement & Measuring Devices |
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Two clocks are being tested against a standard clock located in a national laboratory. At 12:00:00 noon by the standard clock, the readings of the two clocks are :

Clock 1                             Clock 2

Monday                                  12:00:05                           10:15:06

Tuesday                                  12:01:15                           10:14:59

Wednesday                             11:59:08                           10:15:18

Thursday                                12:01:50                           10:15:07

Friday                                     11:59:15                           10:14:53

Saturday                                 12:01:30                           10:15:24

Sunday                                   12:01:19                           10:15:11

If you are doing an experiment that requires precision time interval measurements, which of the two clocks will you prefer?

1.  Clock 1

2.  Clock 2

3.  Neither clock 1 nor clock 2

4.  Both clock 1 and clock 2

Subtopic:  Errors |
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We measure the period of oscillation of a simple pendulum. In successive measurements, the readings turn out to be 2.63 s, 2.56 s, 2.42 s, 2.71 s and 2.80 s. The average absolute error and percentage error, respectively, are:

1.  0.22 s and 4

2.  0.11 s and 4

3.  4 and 0.11 s

4.  5 and 0.22 s

Subtopic:  Measurement & Measuring Devices |
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The temperatures of two bodies measured by a thermometer are

${\mathrm{t}}_{1}$ = 20 oC ± 0.5 oC and ${\mathrm{t}}_{2}$ = 50 oC ± 0.5 oC.

The temperature difference with permissible error is:

1.  31 oC ± 0.5 oC

2.  30 oC ± 1.0 oC

3.  30 oC ± 0.0oC

4.  30 oC ± 1.5 oC

Subtopic:  Errors |
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The resistance R = $\frac{\mathrm{V}}{\mathrm{I}}$ where V = (100 ± 5)V and = (10 ± 0.2)A. The percentage error in R is:

1.  $5%$

2.  $2%$

3.  $7%$

4.  $3%$

Subtopic:  Errors |
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Two resistors of resistances  ohm and  ohm are connected in series, the equivalent resistance of the series combination is:

1.  (300 ± 7) ohm

2.  (300 ± 1) ohm

3.  (300 ± 0) ohm

4.  (100 ± 1) ohm

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Two resistors of resistances  ohm and  ohm are connected in parallel. The equivalent resistance of the parallel combination is:

1.  (300 ± 7) ohm

2.  (66.7 ± 7) ohm

3.  (66.7 ± 1.8) ohm

4.  (100 ± 1) ohm

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The relative error in Z, if Z = $\frac{{\mathrm{A}}^{4}{\mathrm{B}}^{1/3}}{{\mathrm{CD}}^{3/2}}$ is:

1.

2.

3.

4.

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The period of oscillation of a simple pendulum is . Measured value of L is 20.0 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using a wrist watch of 1 s resolution. The percentage error in is:

1.  $2%$

2.  $3%$

3.  $5%$

4.  $0%$

Subtopic:  Errors |
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