Physics Practice Question and Answer
8 Q: What is the correct order of radiations in descending order of frequencies?
480 064b52707efb5ba16688213e1
64b52707efb5ba16688213e1- 1Infrared > Microwaves > Radio waves > X-raysfalse
- 2Radio waves > X-rays > Microwaves > Infraredfalse
- 3X-rays > Infrared > Microwaves > Radio wavestrue
- 4Infrared > Microwaves > X-rays > Radio wavesfalse
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Answer : 3. "X-rays > Infrared > Microwaves > Radio waves"
Explanation :
The correct order of radiations is in descending order of frequencies.
X-rays > Infrared > Microwaves > Radio waves
Q: What is the degree of dissociation for strong electrolytes?
479 063c7ccbc8731ac33279b21f7
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: Which of the following is correct about uniform acceleration?
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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: Consider copper and aluminum wire whose length and resistance are the same. Also, the specific resistance of aluminum is more than copper. Select the correct statement
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63c8d853b338bc336f0c3de7- 1Copper and aluminum mass are the samefalse
- 2Copper wire has more mass than the aluminum wirefalse
- 3Copper wire has less mass than the aluminum wirefalse
- 4The information given is incompletetrue
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Answer : 4. "The information given is incomplete "
Q: What does an electric dipole experience when it is kept in the non-uniform electric field?
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63c8e9d71c47ef334be0efc0- 1Only a forcefalse
- 2Only torquefalse
- 3Force and torque bothtrue
- 4Neither force nor torquefalse
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Answer : 3. "Force and torque both"
Explanation :
An electric dipole always experiences a torque when placed in uniform as well as non-uniform electric field. But in non-uniform electric field, dipole will also experience net force of attraction. So the electric dipole in non-uniform electric field experiences both torque and force.
Q: The amount of work done in moving a charge of 4C across two points having a potential difference of 6V is ______.
467 0641974a1b34a0b67fcf4a8bf
641974a1b34a0b67fcf4a8bf- 148 Jfalse
- 212 Jfalse
- 336 Jfalse
- 424 Jtrue
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Answer : 4. "24 J"
Q: Which of the following elements has the largest atomic radii?
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6419aed45bff3d098df69c79- 1Berylliumfalse
- 2Lithiumtrue
- 3Nitrogenfalse
- 4Carbonfalse
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Answer : 2. "Lithium"
Explanation :
Francium (Fr) has the highest atomic radius in the periodic table. It belongs to the alkali metals group. Its atomic number is 87. The periodic trend of atomic radius suggests that the atomic radius usually decreases along a period (left to right) and increases down a group (top to bottom).
Q: Degree of dissociation does not depend on which of the following factors?
459 063c7cd09b338bc336f093b86
63c7cd09b338bc336f093b86- 1Nature of the solutefalse
- 2Nature of the solventfalse
- 3Soundtrue
- 4Concentrationfalse
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Answer : 3. "Sound "
Explanation :
The Degree of dissociation does not depend on catalyst.The equivalent conductivity of 0.1M weak acid is 100 times less than that at infinite dilution.