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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A screw gauge gives the following readings when used to measure the diameter of a wire :

Main scale reading: 0 mm

Circular scale reading: 52 divisions 

Given that 1 mm on the main scale corresponds to 100 divisions on the circular scale, the diameter of the wire that can be inferred from the given data is

1. 0.26 cm 

2. 0.052 cm 

3. 0.52 cm 

4. 0.026 

Subtopic:  Measurement & Measuring Devices |
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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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