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Quiz 14
Mdcat-past-papers - UHS - Physics Quiz
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Board: UHS | Subject: Physics |
261. According to First law of thermodynamics when heat flows into a system and no work is done the internal energy of the system must :
Increase
Decrease
Remains constant
Becomes zero
262. If the length of the conductor is made 4 times its original length, its resistance becomes :
quarter
half
zero
4 times
263. The unit of temperature coefficient of resistivity is :
1/C
1/K
1/A
1/omege
264. The work done by the gravitational force on an object as it moves from a reference level to a higher point is:
Always positive
Always negative
Zero
Depends on the path taken
265. If two speakers emit sound at same frequency and phase, maximum loudness occurs when:
Path difference = λ/2
Path difference = λ
Path difference = λ/4
Path difference = 3λ/4
266. When an object attains terminal velocity, its acceleration is:
9.8 m/s2
Zero
1 m/s2
9.8 m/s2
267. A 0.5 kg ball moving at 6 m/s has kinetic energy
9 J
18 J
6 J
3 J
268. A fluid is flowing through a tube, to undergo transition from laminar to turbulent flow its velocity must be:
Slightly less than critical velocity
equal to critical velocity
greater than critical velocity
increasing gradually but less than critical velocity
269. For two equal positive charges, the electric field weakest?
Midway between them
Along the perpendicular bisector
Close to either charge
At infinity
270. A projectile is launched in air with certain angle; its velocity is maximum at:
Point of projection
Highest point
Between launching and highest point
At all points
271. If the distance between two charges is halved and magnitude of charges are also doubled, then the force between these charges becomes:
two times
four times
eight times
sixteen times
272. If a body having mass m1 (2 kg), moving with 5 m/s approaches another mass, m2 (3 kg) with speed of 1 m/s in same direction, relative speed of approach is 4 m/s. Relative speed of separation after collision will be:
4 m/s
2 m/s
6 m/s
depends on masses
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