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question_answer1)
Which of the following is the S.I. unit of force?
A)
Newton done
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B)
Meter done
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C)
Joule done
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D)
Ampere done
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E)
None of these done
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question_answer2)
A ball weighing \[\frac{1}{2}\] kg has a kinetic energy 1 joule when its speed is:
A)
1 m/s done
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B)
2 m/s done
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C)
3 m/s done
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D)
4 m/s done
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E)
None of these done
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question_answer3)
What kind of energy is present in a rotating wheel?
A)
Kinetic energy done
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B)
Electrical energy done
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C)
Potential energy done
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D)
Wind energy done
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E)
None of these done
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question_answer4)
An object of 10 kg moves with a uniform velocity of 2 m/s, what is the kinetic energy possessed by the object?
A)
20 J done
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B)
10 J done
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C)
40 J done
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D)
30 J done
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E)
None of these done
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question_answer5)
A person lifts a luggage of 10 kg at the height of 2 m above the ground. What is the potential energy possessed by the luggage?
A)
180 J done
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B)
196 J done
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C)
20 J done
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D)
10 J done
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E)
None of these done
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question_answer6)
What is the S.I. unit of power?
A)
Joule done
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B)
Newton done
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C)
Newton meter done
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D)
Watt done
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E)
None of these done
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question_answer7)
An object is dropped from certain height. Which of the following statements is correct about the object when it is about to reach the ground?
A)
It has minimum kinetic energy. done
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B)
It has maximum kinetic energy. done
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C)
The kinetic energy is zero at this point. done
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D)
It has maximum potential energy. done
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E)
None of these done
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question_answer8)
Law of conservation of energy states that_____.
A)
Total energy of system remains constant. done
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B)
Energy cannot be created or destroyed. done
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C)
There is no gain or loss of energy in a system. done
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D)
All the above done
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E)
None of these done
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question_answer9)
Mechanical energy of a system is equal to _____
A)
\[mgh+\frac{1}{2}m{{v}^{2}}\] done
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B)
\[mg+m{{v}^{2}}\] done
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C)
\[mgh+\frac{1}{2}m\] done
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D)
\[mgh+\frac{1}{2}{{v}^{2}}\] done
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E)
None of these done
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question_answer10)
What is the work done in lifting a mass of 10 kg at a height of 100 cm?
A)
90 J done
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B)
98 J done
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C)
96 J done
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D)
92 J done
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E)
None of these done
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question_answer11)
Which one of the following statements is incorrect?
A)
Sound is a form of energy. done
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B)
Sound energy enables us to hear. done
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C)
Sound waves are electromagnetic waves. done
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D)
All the above done
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E)
None of these done
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question_answer12)
Which one of the following statements is correct?
Statement 1: Sound waves are longitudinal waves. |
Statement 2: Sound waves have low frequency and long wavelength. |
A)
Statement 1 done
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B)
Statement 2 done
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C)
Both statements are correct done
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D)
Both statements are incorrect done
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E)
None of these done
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question_answer13)
Which of the following statements is correct?
A)
Frequency is directly proportional to time period. done
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B)
Frequency is directly proportional to square root of time period. done
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C)
Frequency is inversely proportional to time period. done
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D)
Frequency is inversely proportional to square root of time period. done
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E)
None of these done
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question_answer14)
Which one of the following statements is correct?
A)
The speed of sound depends on the nature of medium through which it travels. done
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B)
The speed of sound depends on the temperature of medium through which it travels. done
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C)
The speed of sound depends on the humidity of air when it travels in air. done
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D)
All the above done
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E)
None of these done
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question_answer15)
A sound wave has a frequency of 5 kHz and wavelength 10 cm. How long will it take to travel 2.5 km?
A)
5 s done
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B)
4 s done
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C)
3 s done
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D)
2 s done
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E)
None of these done
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question_answer16)
Which of the following is the hearing range for human beings?
A)
20 Hz to 200 Hz done
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B)
2 Hz to 200 Hz done
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C)
20 Hz to 20 kHz done
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D)
20 kHz to 200 kHz done
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E)
None of these done
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question_answer17)
Sound waves travel in air with a speed of about 340 m/s. What is the wavelength of sound whose frequency is 500 hertz?
A)
0.68 m done
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B)
0.70 m done
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C)
0.72 m done
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D)
0.74 m done
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E)
None of these done
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question_answer18)
The sound having too high frequency which cannot be heard by human beings are called:
A)
Audible sound done
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B)
Ultrasound done
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C)
Infrasound done
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D)
All the above done
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E)
None of these done
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question_answer19)
In a cloud, lightning and thunder are produced simultaneously. If thunder is heard by a man 5 seconds after the lightening is seen, how far the cloud is from the man? (Speed of sound in air = 340 m/s)
A)
1500 m done
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B)
1600 m done
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C)
1700 m done
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D)
1800 m done
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E)
None of these done
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question_answer20)
Which among the following is represented by Force \[\times \] Displacement?
A)
Frequency done
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B)
Work done done
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C)
Speed done
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D)
Time done
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E)
None of these done
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question_answer21)
A man pushing a computer by applying a force of 15 N. Find the work done by this force in displacing the computer through 20 cm along the direction of the push.
A)
300 J done
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B)
3 N done
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C)
3.4 J done
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D)
3 J done
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E)
None of these done
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question_answer22)
Which of the following statements is incorrect?
A)
Work done is positive when displacement is along the force applied. done
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B)
Work done is negative when displacement is opposite the force applied. done
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C)
Work done is zero when displacement is perpendicular to the force applied. done
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D)
All the above done
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E)
None of these done
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question_answer23)
In which of the following examples mechanical energy is transformed into heat energy?
A)
Electrolysis done
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B)
Rubbing two pieces of stone to generate fire. done
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C)
Burning of magnesium. done
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D)
In steam engine. done
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E)
None of these done
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question_answer24)
The energy consumed in KWh in 6 hours by 2 devices of power 500W each.
A)
5000 kwh done
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B)
5 kwh done
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C)
2.5 kwh done
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D)
2500 kwh done
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E)
None of these done
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question_answer25)
If mass is halved and velocity increased by eight times then kinetic energy will be:
A)
Halved done
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B)
\[\frac{1}{4}\,times\] done
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C)
4 times done
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D)
8 times done
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E)
None of these done
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question_answer26)
In which of the following air blown into is made to vibrate?
A)
Mridangam done
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B)
Shehnai done
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C)
Veena done
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D)
Violin done
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E)
None of these done
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question_answer27)
If an electric tubelight of 40 watt is lighted for 3 hours daily, how much KWh energy would be consumed?
A)
120 Kwh done
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B)
1200 Kwh done
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C)
0.12 Kwh done
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D)
13.6 Kwh done
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E)
None of these done
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question_answer28)
A man of mass 86 kg climbs 40 steps of a staircase, each measuring \[15\,cm\] high. The potential energy gained by the boy is: \[[g=9.8\,m/{{s}^{2}}]\]
A)
5000 J done
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B)
5056.8 J done
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C)
6000 J done
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D)
500 J done
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E)
None of these done
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question_answer29)
A girl is carrying a school bag of 3 Kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be \[(g=10\,m/{{s}^{2}})\]:
A)
\[6\times {{10}^{3}}\,J\] done
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B)
6 J done
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C)
0.6 J done
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D)
Zero done
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E)
None of these done
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question_answer30)
An arrow of mass \[80\,g\]is moving with a velocity of\[100\text{ }m/s\]. The kinetic energy of the arrow is:
A)
40 J done
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B)
400 J done
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C)
40,0000 J done
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D)
8,000 J done
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E)
None of these done
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question_answer31)
An iron sphere of mass \[10\text{ }kg\]has the same diametre as an aluminium sphere of mass is\[3.5\,kg\]. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:
A)
Acceleration done
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B)
Momenta done
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C)
Potential energy done
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D)
Kinetic energy done
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E)
None of these done
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question_answer32)
A pen is dropped from a height H. When it reaches the ground, its velocity is\[50\text{ }m/s\]. The value of H is\[\left( g=9.8\,m/{{s}^{2}} \right)\]:
A)
55 m done
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B)
127.5 m done
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C)
105 m done
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D)
120 m done
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E)
None of these done
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question_answer33)
The kinetic energy of body depends:
A)
On the mass of the body only. done
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B)
On the velocity of the body only. done
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C)
Both [a] and [b] done
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D)
Either [a] or [b] done
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E)
None of these done
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question_answer34)
In which of the following cases the potential energy of an elastic rubber band is minimum?
A)
When it is compressed. done
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B)
When it is extended. done
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C)
When it is at its natural length. done
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D)
When it is at its natural length but is kept at a height h above the ground. done
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E)
None of these done
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question_answer35)
Which one of the following statements best describes the definition of amplitude of sound wave in air?
A)
Amplitude is how the brain interprets the frequency of sound. done
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B)
Amplitude is the maximum displacement of a layer of air from its mean position as the sound wave passes through. done
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C)
Amplitude is the persistence of sound due repeated reflection. done
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D)
All the above. done
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E)
None of these done
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question_answer36)
A body is falling from a height h. After it has fallen a height h/2, it will possess:
A)
Only potential energy done
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B)
Only kinetic energy done
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C)
Half potential and half kinetic energy done
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D)
More kinetic and less potential energy done
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E)
None of these done
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question_answer37)
Which of the following is correct?
A)
Loudness of sound depends on the frequency of sound. done
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B)
The higher the frequency, the higher is the pitch. done
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C)
The unit of amplitude is\[kg/{{m}^{3}}\]. done
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D)
Both [b] and [c] done
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E)
None of these done
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question_answer38)
In which of the following multiple reflections of sound is used?
A)
In stethoscopes done
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B)
In megaphones done
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C)
Design of concert halls done
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D)
All the above done
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E)
None of these done
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question_answer39)
In which part of the ear cochlea is present?
A)
Inner ear done
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B)
Middle ear done
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C)
Outer ear done
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D)
Brain done
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E)
None of these done
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question_answer40)
A sound-wave source produces 40 crests and 40 troughs in 0.4 second. Find the frequency of the wave.
A)
40 hz done
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B)
400 hz done
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C)
100 hz done
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D)
10.4 hz done
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E)
None of these done
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