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Question: patla lence kisay kahtey haiby: rohan456 (Profile)
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Question: patla lence kya haiby: rohan456 (Profile)
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Question: Physics Quiz For SSC CGL - 2017by: Alok (Profile)
Ans: 1. The minimum velocity required by a satellite to escape earth's gravitational pull is
a) 18 km/s
b) 11.2 km/s
c) 21 km/s
d) 35 km/s
2. The period of a geostationary(synchronous) satellite orbiting the earth over the equator is
a) 16 hours
b) 12 hours
c) 20 hours
d) 24 hours
3. The escape velocity of a satellite projected from the surface of the earth is independent of
a) the mass of earth
b) the mass of the satellite
.....Read more...
Question: Which gas is filled in electric bulb?by: kapil143 (Profile)
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Question: What is physics? by: nirmalsingh83 (Profile)
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Question: which subatomic particales carry negative electrical chargeby: anilk84 (Profile)
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Question: विधुत धारा को किसमे मापा जाता है ?
A. ऐम्पियर
B. घटे मे
C. फेराडे मे
D. उर्जा मby: Vishal (Profile)
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Question: Ghan kon ka SI maatrak kya hogaby: 8935993758 (Profile)
A: bebar
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B: kendela
C: astarediyan
D: non of these
Question: लेंस की क्षमता का मात्रक क्या है ?by: vipul (Profile)
Ans: डायोप्टर
Question: One nanometer is equal to ?by: Puneet (Profile)
A: 10-6m
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B: 10-8m
C: 10-9m
D: 10-5m
Question: Nuclear sizes are expressed in a unit named ?by: Puneet (Profile)
A: Fermi
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B: angstrom
C: newton
D: tesla
Question: It is easier to roll a stone up a sloping road than to lift it vertical upwards becauseby: luckykushwaha5 (Profile)
A: work done in rolling is more than in lifting
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B: work done in lifting the stone is equal to rolling it
C: work done in both is same but the rate of doing work is less in rolling
D: work done in rolling a stone is less than in lifting it
Question: Radiocarbon is produced in the atmosphere as a result ofby: luckykushwaha5 (Profile)
A: collision between fast neutrons and nitrogen nuclei present in the atmosphere
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B: action of ultraviolet light from the sun on atmospheric oxygen
C: action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
D: lightning discharge in atmosphere
Question: Nuclear sizes are expressed in a unit namedby: luckykushwaha5 (Profile)
A: Fermi
Not Answered


B: angstrom
C: newton
D: tesla
Question: Radiocarbon is produced in the atmosphere as a result ofby: luckykushwaha5 (Profile)
A: collision between fast neutrons and nitrogen nuclei present in the atmosphere
Not Answered


B: action of ultraviolet light from the sun on atmospheric oxygen
C: action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
D: lightning discharge in atmosphere
Question: Calculate the time required to heat 20 kg of water from 100C to 350C using an immersion heater rated 1000 W. Assume that 80% of the power input is used to heat the water. Specific heat capacity of water = 4200 J/Kg - k
by: scorpio (Profile)
Ans: Let us consider the required time is t.
power of the immersion heater is 1000W, 80% power is used only so used power = 1000*80/100 = 800W.
work done by the immersion heater due to this power is W = P*t = 800t
this is the form of electrical energy this energy will be used to heat the water so
Heat give by the Heater = Heater taken by the water
800t = ms(T2 -T1)
800t = 20*4200*[(273+35) - (273+10)] we have added 273 because we will take temp. in kelvin
800t = .....Read more...
Question: Two bodies are connected with a spring and one of the particles is given a velocity v find 1* maximum velocity of second particle and 2* max. extension in the spring. Answer fast please!by: scorpio (Profile)
Ans: when velocity is given to one body the that time the amplitude of oscillations will be maximum compression in the spring . At the time of maximum compression, velocities of both the bodies will be equal say V1. and this velocity be the velocity of the second body at the of release after compression. so by law of conservation of momentum ---
m1*v = (m1+m2)V1 if the mass of bodies is m1 and m2
so V1 = (m1*v) / (m1+m2) ------------------------------------(i)
by the conservation of e .....Read more...
Question: Who discovered pricipal of electromagnetic induction ?by: Rohit65 (Profile)
A: James Clerk Maxwell
Not Answered


B: Michael Faraday
C: Humphry Davy
D: Alessandro Volta
Question: A car moving on a straight road is anby: yashovardhan7777 (Profile)
A: Curvilinear motion
Not Answered


B: Rectilinear Motion
C: Periodic motion
D: Rotational motion
Question: What is it that goes up and goes down but does not move?by: ayushturkar (Profile)
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Question: What metal is the best conductor of electricity?by: Alok (Profile)
A: Aluminium
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B: Silver
C: Copper
D: Graphite
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