Physics Questions Practice Question and Answer
8 Q: Which of the following is correct about uniform acceleration?
630 064a2adc98dcbe3218b096682
64a2adc98dcbe3218b096682- 1An object moving on friction-less surface can gain uniform acceleration.false
- 2An object under free fall is an example of uniform acceleration.true
- 3An object moving with constant speed is an example of uniform acceleration.false
- 4Motion of a spring is an example of uniform acceleration.false
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Answer : 2. "An object under free fall is an example of uniform acceleration."
Explanation :
1. The change in velocity of an object at equal time intervals is called uniform acceleration.
2. A freely falling object is an example of uniform acceleration.
Q: Identify the correct statement.
444 0649aa3043662c8741dfd960b
649aa3043662c8741dfd960b- 1Newton is a unit of force.true
- 2Newton is a unit of power.false
- 3Joule is a unit of force.false
- 4Joule is a unit of power.false
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Answer : 1. "Newton is a unit of force."
Explanation :
1. Newton is the SI unit of force. It is a unit force that causes an acceleration of one meter per second on one kilogram of mass.
- Force can be defined as:
Force =Mass x Acceleration
2. Joule is the SI unit of energy and work. It is the unit work done by one Newton force over a distance of one meter.
- Energy can be defined as:
Energy = Work x Time
Q: Who found an empirical relationship between the half-life of alpha decay and the energy of the emitted alpha particles in 1911?
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649a9fbcc7d7c7e0672ba384- 1Fermi and Meitnerfalse
- 2Geiger and Nuttalltrue
- 3Chadwick and Lawrencefalse
- 4Soddy and Astonfalse
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Answer : 2. "Geiger and Nuttall "
Explanation :
In 1911, Geiger and Nuttall discovered an empirical relationship between the half-life of alpha decay and the energy of the emitted alpha particles.
Q: Match the columns.
Column - A Column-B
I. Electric current a. Henry
II. Potential difference b. Farad
III. Gapacitance c. Volt
IV. inductance d. Ampere
716 0649a9c63dad6f2e01f6df4c3
649a9c63dad6f2e01f6df4c3- 1i-a, ii-b, iii-c, iv-dfalse
- 2i-b, ii-a, iii-c, iv-dfalse
- 3i-d, ii-c, iii-b, iv-atrue
- 4i-a, ii-c, iii-b, iv-dfalse
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Answer : 3. "i-d, ii-c, iii-b, iv-a"
Explanation :
The columns are a correct match.
I. Electric current - Ampere
II. Potential difference - c. Volt
III. Gapacitance - b. Farad
IV. inductance - a. Henryd.
Q: According to Dalton’s atomic theory, atoms combine in the ratio of small whole numbers to form ______.
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64919f9ec7d7c7e0670d10b8- 1Neutronsfalse
- 2Moleculesfalse
- 3Protonsfalse
- 4Compoundstrue
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Answer : 4. "Compounds"
Explanation :
1. According to Dalton's atomic theory, atoms combine in small whole-number proportions to form compounds.
Q: A 40kVA transformer has core loss of 400 W & full load copper loss of 800 W. The proportion of full load at maximum efficiency is -
679 06304af8620c0656a1d925419
6304af8620c0656a1d925419- 150%false
- 262.3%false
- 370.7%true
- 4100%false
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Answer : 3. "70.7%"
Q: The splitting of white light into its component colours is called ______.
695 0642c1a37dcb650c1457945eb
642c1a37dcb650c1457945eb- 1refractionfalse
- 2reflectionfalse
- 3scatteringfalse
- 4Dispersiontrue
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Answer : 4. "Dispersion"
Q: The amount of work done in moving a charge of 4C across two points having a potential difference of 6V is ______.
591 0641974a1b34a0b67fcf4a8bf
641974a1b34a0b67fcf4a8bf- 148 Jfalse
- 212 Jfalse
- 336 Jfalse
- 424 Jtrue
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