Physics and Measurement (NEET Physics): Questions 56 - 59 of 61

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Passage

Three of the fundamental constants of physics are the universal gravitational constant, G = 6.7 x 10 -11 m 3 kg -1 s -2, the speed of light, c = 3.0 x 10 8 m/s, and Planck’s constant,

h = 6.6 x 10 -34 kg m 2 s -1.

Question number: 56 (2 of 2 Based on Passage) Show Passage

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

The energy of a photon is given by E = hcλ If λ = 4 x 10 - 7 m, the energy of photon is

The universal gravitational constant, G = 6.7 x 10 -11 m 3 kg -1 s -2, the speed of light, c = 3.0 x 10 8 m/s, and Planck’s constant, h = 6.6 x 10 -34 kg m 2 s -1.

Choices

Choice (4) Response

a.

4.5 eV

b.

2.10eV

c.

3.0 eV

d.

3.95 eV

Question number: 57

» Physics and Measurement » Dimensional Analysis and Its Applications

MCQ▾

Question

In an experiment the angles are required to be measured using an instrument, 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half- a degree (= 0.5°), then the least count of the instrument is:

Choices

Choice (4) Response

a.

half minute

b.

one minute

c.

one degree

d.

half degree

Question number: 58

» Physics and Measurement » Fundamental and Derived Units. Least Count

MCQ▾

Question

A Vernier caliper N divisions of Vernier scale coincides with N - 1 divisions of main scale (in which length of one division is 1 mm). The least count of the instrument should be

Choices

Choice (4) Response

a.

1 10 N

b.

N-1

c.

N

d.

1/N - 1

Question number: 59

» Physics and Measurement » Accuracy and Precision of Measuring Instruments

MCQ▾

Question

A student performs an experiment for determination of g=(4π2lT2) . The error in length is ∆ and in time T is ∆ T and n is number of times the reading is taken. The measurement of g is most accurate for

Choices

Choice (4) Response

a.

∆l = 5mn, ∆ T = 0.2 sec, n = 10

b.

∆l = 5mn, ∆T = 0.2 sec, n = 20

c.

∆l = 5mn, ∆T = 0.1 sec, n = 10

d.

∆l = 1mn, ∆T = 0.1 sec, n = 50

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