Physics Mcqs test No 5

There are 10 MCQS.Choose the option that is you think is correct.Give all of your answers in a single comment. (like 1A,2B,3C )

(1)All of the following quantities remain constant in step-up transformer except :
A. power
B. voltage
C. heat
D. current

(2)After stretching a wire, its radius becomes r/2 ,then its resistance (R) will become :
A. 4R
B. 16R
C. 0
D. 2R

(3) Frequency of X-rays depend on :
A. Number of electrons striking target
B. Nature of target
C. Accelerating potential
D. Both B and C

(4) Bottom quark carries a charge :
A. 2/3e
B. 1/3e
C. -1/3e
D. -2/3e

(5) A 100-watt bulb is operated at 200 volts,the current flowing through the bulb is ___ amperes.
A. 0
B. 2.5
C. 1
D. 0.5

(6) All are pairs of derived units except :
A. kilogram,kelvin
B. metre,newton
C. ampere,joule
D. coulomb,second

(7) In a hockey match,500 spectators are counted one by one,how many significant figures are there in the final result ?
A. 1
B. 2
C. 3
D. 0

(8) If Rx is Positive and Ry is negative the vector R lies in ___ quadrant.
A. 1st
B. 2nd
C. 3rd
D. 4rth

(9) In projectile motion, the horizontal component of velocity ____  throughout the flight.
A. increases
B. decreases
C. remains constant
D. none of these

10) All of the following change when force is applied on a body except :
A. velocity
B. acceleration
C. position
D. mass

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