A screw gauge gives the following reading when used to measure the diameter of a wire.

Main scale reading: 0 mm

Circular scale reading: 52 divisions

Given that 1 mm on main scale corresponds to 100 divisions of the circular scale.  The diameter of wire from the above data is:

(1) 0.052 cm

(2) 0.026 cm

(3) 0.005 cm

(4) 0.52 cm

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If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities, then find the dimensions of energy.

1. [F][A][T-1]

2. [F][A-1][T]

3. [F][A][T]

4. [F][A][T2]

Subtopic:  Dimensions |
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If E and G, respectively, denote energy and gravitational constant, then EG has the dimensions of:

1. ML0T0

2. M2L-2T-1

3. M2L-1T0

4. ML-1T-1

Subtopic:  Dimensions |
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A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is:
1. 0.25 mm
2. 0.5 mm
3. 1.0 mm
4. 0.01 mm

Subtopic:  Measurement & Measuring Devices |
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Taking into account the significant figures, what is the value of (9.99m - 0.0099m)?

1. 9.98 m

2. 9.980 m

3. 9.9 m

4. 9.9801 m

Subtopic:  Significant Figures |
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The energy required to  break one bond in DNA is 10-20 J. This value in eV is nearly : 

1. 0.6

2. 0.06

3. 0.006

4. 6

Subtopic:  Dimensions |
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Dimensions of stress are:

1. ML2T-2

2. ML0T-2

3. ML-1T-2

4. MLT-2

Subtopic:  Dimensions |
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The angle of 1' (minute of an arc) in radian is nearly equal to:

1.  2.91 × 10-4  rad

2.  4.85 × 10-4  rad

3.  4.80 × 10-6  rad

4.  1.75× 10-2  rad

Subtopic:  Measurement & Measuring Devices |
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Time intervals measured by a clock give the following readings : 

1.25 sec, 1.24 sec, 1.27sec, 1.21 sec and 1.28 sec. 

What is the percentage relative error of the observations? 

1. 2 %

2. 4 %

3. 16 %

4. 1.6 %

Subtopic:  Errors |
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The unit of thermal conductivity is:

1. W m-1K-1

2. J m K-1

3. J m-1K-1

4. W m K-1

Subtopic:  Dimensions |
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