The angle of 1° (degree) will be equal to:

(Use 360°=2π rad, 1°=60' and 1'=60'')

1 1.034×10-3 rad2 1.745×10-2 rad31.524×10-2 rad4 1.745×10+3 rad

Subtopic:  Measurement & Measuring Devices |
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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 θ = 40° (θ is known as ‘parallax’), the distance of the tower C from his original position A is:

(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 × 107 m, the distance of the moon from the Earth is:

1 2.91×108 m2 3.11×109 m3 3.84×108 m4 1.91×107 m

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 1.496×1011 m. The diameter of the Sun:

1.  2.39×109 m

2.  0.39×109 m

3.  1.39×109 m

4.  1.39×1010 m

Subtopic:  Measurement & Measuring Devices |
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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 |
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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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NEET MCQ Books for 11th Physics, Chemistry & Biology