11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil இயற்கை வேளாண்மை,சுற்றுச்சூழல் -செய்யுள் - மனோன்மணீயம் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil என்னுயிர் என்பேன் -துணைப்பாடம் - இசைத்தமிழர் இருவர் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மொழி கலை -செய்யுள் - ஒவ்வொரு புல்லையும் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - இலக்கணம் - பகுபத உறுப்புகள் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - துணைப்பாடம் - வாடிவாசல் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - செய்யுள் - குறுந்தொகை Important Questions And Answers Study Material - QB365 Set A
Published on: 10/11/2020
11th Standard Physics Work, Energy and Power English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021
Download Tamil Nadu 11th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
An object is thrown vertically upwards as it rises its total energy ____________.
decreases
increases
remains constant
none of the above
2.
The total work done on a particle is equal to the change in its kinetic energy ______________.
always
only if the force acting on the body are conservative
only in the internal frame
only if no external force is acting
3.
Which one of the following is not a conservative force?
Gravitational force
Electrostatic force between two changes
Magnetic force, between two magnetic dipoles
Frictional force
4.
An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water of the jet. What is the rate at which kinetic energy is imparted to water?
\({{1}\over{2}}{m}{v}^{2}\)
mv3
\({{1}\over{2}}{m}{v}^{3}\)
\({{1}\over{2}}{m}{v}^{2}\)
5.
In an elastic collision
both momentum and kinetic energy are conserved
only kinetic energy is conserved
both momentum and kinetic energy are not conserved
only momentum is conserved
6.
The potential energy of a system increases if work is done ______________.
upon the system by a non-conservative force
upon the system by a conservative force
By a system against conservative force
By a system against non conservative force
7.
A particle of mass m1 is moving with a velocity v, and another of mass m2 is moving with velocity v2 Both of them have the some momentum but their kinetic energies are E1 and E2 respectively. If =m1 > m2 the ______________.
E1
\(\frac{E_1}{E_2}=\frac{m_1}{m_2}\)
E1>E2
E1=E2
8.
A bullet is fired and gets embedded in a block kept on table. If table is frictionless, then _____________.
Kinetic Energy gets conserved
Potential Energy gets conserved
Momentum conserved
both (a) and (c)
9.
How are joule (J) and ergs related _______________.
1 J = 107 erg
1 erg = 10-7 J
1 J = 10-7 erg
none
10.
An iron sphere of mass 8 kg has the same diameter as a copper sphere of mass 4 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same ____________.
acceleration
momenta
Potential Energy
Kinetic Energy
11.
Water stored in a dam possesses _______________.
no energy
electrical energy
kinetic energy
potential energy
12.
A force\(\overrightarrow { F } =3\hat { i } +c\hat { j } +2\hat { k } \) acting on a particle causes a displacement \(\overrightarrow { S } =(2\hat { i } -3\hat { j } +4\hat { k } )\) in its own direction. If the work done is 8J, then the value of c is ______________.
0
6
2
1
13.
In case of negative work, the angle between the force and displacement is ______________.
00
900
450
1800
14.
If momentum of a body increases by 100% then what will be percentage increase in its kinetic energy?
200%
100%
300%
400%
15.
16.
A wind-powered generator converts wind energy into electric energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed v, the electrical power output will be proportional to
v
v2
v3
v4
17.
If the linear momentum of the object is increased by 0.1% then the kinetic energy is Increased by
0.1 %
0.2 %
0.4 %
0.01 %
18.
What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop?
\(\sqrt{2gR}\)
\(\sqrt{3gR}\)
\(\sqrt{5gR}\)
\(\sqrt{gR}\)
19.
A particle of mass m is being rotated on a vertical circle of radius r. If the speed of particle at the highest point be v, then ______________.
mg=\(\frac{mv^{2}}{r}\)
mg>\(\frac{mv^{2}}{r}\)
mg<\(\frac{mv^{2}}{r}\)
mg≥\(\frac{mv^{2}}{r}\)
20.
A ball of mass 1 kg and another of mass 2 kg are dropped from a tall building whose height is 80 m. After, a fall of 40 m each towards Earth, their respective kinetic energies will be in the ratio of
\(\sqrt2:1\)
\(1:\sqrt2\)
2:1
1:2
1.
(c)
remains constant
2.
(a)
always
3.
(d)
Frictional force
4.
Mass per unit length = m
Velocity = v
(mass of water pumped in one second)
M = mv
\(\text { Kinetic energy }=\frac{1}{2} M v^{2}\)
\(=\frac{1}{2} m v^{3}\)
5.
(a)
both momentum and kinetic energy are conserved
6.
(c)
By a system against conservative force
7.
(a)
E1
8.
(c)
Momentum conserved
9.
(b)
1 erg = 10-7 J
10.
(a)
acceleration
11.
(d)
potential energy
12.
(c)
2
13.
(d)
1800
14.
(c)
300%
15.
(c)
16.
\(\text { Force }=v \frac{d m}{d t}\)
\(=v \frac{d}{d t} \text { (volume } \times \text { density) }\)
\(=v \frac{d}{d t}(A x p) \)
\(=v A p \frac{d x}{d t} \)
\(=v \times A p \times v \)
\(=A p v^{2} \)
Power = Force x Velocity
\(=A p v^{2} \times v=A p v^{3}\)
\(\therefore \text { Power } \alpha v^{3}\)
17.
\(\text { Kinetic energy } E_{k}=\frac{p^{2}}{2 m}\)
\(\frac{\Delta E_{k}}{E_{k}}=\frac{2 \Delta p}{p}\)
\(\text {Given that } \frac{\Delta p}{p}=0.1\)
∴ Increase in kinetic energy
\(\frac{\Delta E_{k}}{E_{k}}=2 \frac{\Delta p}{p} \)
\(\frac{\Delta E_{k}}{E_{k}}=2 \times 0.1=0.2 \% \)
18.
Radius =R
\(v_{1}^{2}-v_{2}^{2}=4 g R\)
\(\text { Tension } T_{2}=\frac{m v_{2}^{2}}{R_{2}}-m g\)
\(\text {To find minimum speed, let } T_{2}=0\)
\(0 =\frac{m v_{2}^{2}}{R}-m g \)
\(\frac{m v^{2}}{R} =m g \)
\(v_{2}^{2}=R g \ v_{2} =\sqrt{g R} \)
\(\text { sub (2) in the eqn (1) we get }\)
\(v_{1}^{2}-(\sqrt{g R})^{2} =4 g R \)
\(v_{1}^{2}-g R =4 g R \)
\(v_{1}^{2} =4 g R+g R \)
\(=5 g R \)
\(v_{1} =\sqrt{5 g R} \)
19.
(c)
mg<\(\frac{mv^{2}}{r}\)
20.
\(m_{1} =1, \quad m_{2}=2 \)
\(K . E . =m g(h-x) \)
\(\text { For both balls }(h-x)\)
\(=40 \text { i.e.) Same }\)
\(g=\text { constant }\)
\(\therefore K \cdot E_{1}=m_{1} g(h-x)=m_{1} g \times 40 \)
\(K \cdot E_{2}=m_{2} g(h-x)=m_{2} g \times 40 \)
\(\therefore \frac{K \cdot E_{1}}{K \cdot E_{2}}=\frac{m_{1} g \times 40}{m_{2} g \times 40}=\frac{m_{1}}{m_{2}} \)
\( \therefore K \cdot E_{1}: K \cdot E_{2}=1: 2 \)
11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil பீடு பெற நில் - செய்யுள் - காவடிச்சிந்து Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - உரைநடை - மலை இடப்பெயர்கள் : ஓர் ஆய்வு Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - துணைப்பாடம் - யானை டாக்டர் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - செய்யுள் - ஐங்குறுநூறு Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 11th Standard Subjects
Maths
Commerce
Economics
Biology
Business Maths and Statistics
Accountancy
Computer Science
Physics
Chemistry
Maths
Biology
Economics
Physics
Chemistry
History
Business Maths and Statistics
Computer Science
Accountancy
Computer Applications
History
Computer Technology
Commerce
Computer Applications
Computer Technology
Tamil
English
French
Tamilnadu Stateboard Standards
