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# A man wishes to estimate the distance of a nearby tower from him. He stands at point A in front of tower C and spots a very distant object O in line with AC. He then walks perpendicular to AC up to B, a distance of 100 m, and looks at O and C again. Since O is very distant, the direction BO is practically the same as AO; but he finds the line of sight of C shifted from the original line of sight by an angle $$\theta=40^\circ$$ ($$\theta$$ is known as ‘parallax’), the distance of the tower C from his original position A is: (Given $$\tan40^\circ=0.8391$$) 1. 119 m 2. 126 m 3. 320 m 4. 219 m

Subtopic:  Measurement & Measuring Devices |
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The moon is observed from two diametrically opposite points A and B on Earth. The angle θ subtended at the moon by the two directions of observation is $1°$ 54. Given the diameter of the Earth to be about 1.276 × ${10}^{7}$ m, the distance of the moon from the Earth is:

Subtopic:  Measurement & Measuring Devices |
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The Sun’s angular diameter is measured to be 1920′′. The distance of the Sun from the Earth is  The diameter of the Sun:

1.

2.

3.

4.

Subtopic:  Measurement & Measuring Devices |
54%
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If the size of a nucleus (in the range of $$10^{-15}$$ to $$10^{-14}$$ m) 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 $$10^{-5}$$ m to $$10^{-4}$$ m.
1. $$1$$ m
2. $$10$$ m
3. $$10^{-10}$$ m
4. $$10^{-5}$$ m

Subtopic:  Measurement & Measuring Devices |
From NCERT
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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:

 Days 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 |
54%
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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 s and 0.11%

4.  5 s and 0.22%

Subtopic:  Measurement & Measuring Devices |
75%
From NCERT
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The temperatures of two bodies measured by a thermometer are $$t_1=20^\circ \text{C}\pm0.5^\circ \text{C}$$ and $$t_2=50^\circ \text{C}\pm0.5^\circ \text{C}.$$ The temperature difference with permissible error is:
1. $$31^\circ \text{C}\pm0.5^\circ \text{C}$$
2. $$30^\circ \text{C}\pm1.0^\circ \text{C}$$
3. $$30^\circ \text{C}\pm0.0^\circ \text{C}$$
4.
$$30^\circ \text{C}\pm1.5^\circ \text{C}$$

Subtopic:  Errors |
82%
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The resistance $$R=\frac{V}{I}$$ where $$V=(100 \pm 5) ~V$$ and $$I=(10 \pm 0.2)~ A$$. The percentage error in $$R$$ is:
1. $$5\%$$
2. $$2\%$$
3. $$7\%$$
4.
$$3\%$$

Subtopic:  Errors |
81%
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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

Subtopic:  Errors |
84%
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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

Subtopic:  Errors |
52%
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