Physics Practice Question and Answer
8 Q: The device that converts alternating current to direct current is called
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5f72ea2e2d9d25248e04b7bb- 1inverterfalse
- 2rectifiertrue
- 3transformerfalse
- 4transmitterfalse
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Answer : 2. "rectifier"
Q: The air bubble in the water, which will behave like it is
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5f72e7d12d9d25248e04a0c2- 1Convex mirrorfalse
- 2Convex lensfalse
- 3Concave mirrorfalse
- 4Concave lenstrue
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Answer : 4. "Concave lens"
Q: The observer hears a sound from the source which is moving away from the observer who is stationary. Determine the frequency of the sound
1231 063c8f650be373f6c954abbda
63c8f650be373f6c954abbda- 1It is halvedtrue
- 2It remains the samefalse
- 3It reaches infinityfalse
- 4It gets doubledfalse
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Answer : 1. "It is halved"
Explanation :
If the observer is moving away from the source ((Figure)), the observed frequency can be found: λs=vTo−voTovTs=(v−vo)Tov(1fs)=(v−vo)(1fo)fo=fs(v−vov).
Q: Is a mirror always a direct reflection of the real object?
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5f6da310ff25c92a085ba817- 1flat, convex, concavefalse
- 2flat, concavefalse
- 3convex-concavefalse
- 4Plain, convextrue
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Answer : 4. "Plain, convex"
Q: What is the degree of dissociation for strong electrolytes?
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63c7ccbc8731ac33279b21f7- 11true
- 20false
- 3Less than 1false
- 4Greater than 1false
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Answer : 1. "1"
Explanation :
Strong electrolytes have a degree of dissociation close to one, while weak electrolytes have a degree of dissociation less than one. Solvent nature: Solvents with a high dielectric constant show more dissociation. Dilution: As the solution is diluted, the degree of dissociation increases.
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
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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: The light is a:
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61655a273d260361529b02a7- 1Transverse wavetrue
- 2Longitudinal wavefalse
- 3Bothfalse
- 4Nonefalse
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Answer : 1. "Transverse wave "
Q: What is the direction of torque?
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62ce884231b6d20155334fe4- 1Opposite to the direction of applied forcefalse
- 2Parallel to the radiusfalse
- 3Perpendicular to the direction of applied forcetrue
- 4Same as the direction of applied forcefalse
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