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61
ML2T-2 is the dimensional formula for
Discuss
Answer & Solution
Answer: Option D
Solution:
ML2T-2 is the dimensional formula for couple acting on a body.
62
Solar eclipse will take place when
Discuss
Answer & Solution
Answer: Option C
Solution:
Solar eclipse will take place when the moon is between the sun and the earth.
63
Isotopes of an element contain
Discuss
Answer & Solution
Answer: Option A
Solution:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
64
One watt-hour is equivalent to
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Answer & Solution
Answer: Option C
Solution:
One watt-hour is equivalent to 3.6 x 103 J
65
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
Discuss
Answer & Solution
Answer: Option A
Solution:
The Nobel Prize in Physics 1930 was awarded to Sir Chandrasekhara Venkata Raman "for his work on the scattering of light and for the discovery of the effect named after him."
66
In which of the following industries is mica as a raw material?
Discuss
Answer & Solution
Answer: Option D
Solution:
In electrical industries mica is used as a raw material.
67
Radiocarbon dating technique is used to estimate the age of
Discuss
Answer & Solution
Answer: Option D
Solution:
Radiocarbon dating involves determining the age of an ancient fossil or specimen by measuring its carbon-14 content. Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.
68
Identify the vector quantity from the following
Discuss
Answer & Solution
Answer: Option B
Solution:
Angular momentum is a vector quantity.
69
Large astronomical telescopes always use as objective
Discuss
Answer & Solution
Answer: Option C
Solution:
Large astronomical telescopes always use as objective combination of lenses.
70
One should not connect a number of electrical appliances to the same power socket because
Discuss
Answer & Solution
Answer: Option B
Solution:
If we connect many appliances to the same socket, requirement of current for that socket will increase, the wire connected to that socket will have to supply more current, that may exceed its current rating and can damage it.