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

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The temperatures of two bodies measured by a thermometer are

t1 = 20 oC ± 0.5 oC and t2 = 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 

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The resistance R = VI where V = (100 ± 5)V and = (10 ± 0.2)A. The percentage error in R is:

1.  5%

2.  2%

3.  7%

4.  3%

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Two resistors of resistances R1 = 100 ± 3 ohm and R2 = 200 ± 4 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 R1 = 100 ± 3 ohm and R2 = 200 ± 4 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 = A4B1/3CD3/2 is: 

1.  AA+BB +CC+DD

2.  4AA+13BB -CC-32DD

3.  4AA+13BB +CC+23DD

4.  4AA+13BB +CC+32DD

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The period of oscillation of a simple pendulum is T =2πLg. 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%

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