Questions with Answer CET-KARNATAK 

1. The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces. The angle between the two forces is:
a. 1200
b. 600
c. 900
d. 1500
Ans: (a)
2. One kilogram of ice at 00 C is mixed with one kilogram of water at 800 C. the final temperature of the mixture is ( take : specific heat of water = 4200 J kg-1 K-1. Heat of ice = 336 kJ kg-1)
a. 400 C
b. 600 C
c. 00 C
d. 500 C
Ans: (c)
3. A carnot’s engine is made to work between 200  C and 0  C first and then between 00 C and - 2000 C. the ratio of the engine in the two cases is:
a. 1 : 1 73
b. 1 73 : 1
c. 1 : 2
d. 1 : 1
Ans: (a)
4. An object is a placed 12 cm to the left of a converging lens of local length 8 cm. another converging lens of 6 cm focal length is placed at a distance of 30 cm. to the right of the first lens. The second lens will produce:
a. A virtual enlarged image
b. No image
c. A real inverted image
d. A real enlarged image
Ans: (c)
5. The resistance of an incandescent lamp is:
a. Smaller when switched on
b. Greater when switched off
c. The same whether it is switch off or switch on
d. Greater when switched on
Ans: (d)
6. A superconductor exhibits perfect:
a. Ferromagnetism
b. Ferrimagnetism
c. Diamagnetism
d. Paramagnetism
Ans: (c)
7. A magnet is dropped down an infinitely long vertical copper tube. Then:
a. The magnet moves with continuously decreasing velocity and ultimately comes to rest
b. The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity
c. The magnet moves with continuously increasing velocity and acceleration
d. The magnet moves with continuously increasing velocity but constant acceleration
Ans: (b)
8. Whenever a hydrogen atom emits a photon in the Balmer series, it:
a. May emit another photon in the paschen series
b. Need not emit any more photon
c. May emit another photon in the balmer series
d. Must emit another photon in the lyman series
Ans: (d)
9. The SI unit of radioactivity is:
a. Rutherford
b. Roentgen
c. Becqueral
d. Curie
Ans: (d)
10. An ammeter and a voltmeter are joined in series to a cell. Their reading are A and V respectively. If a resistance is now joined in parallel with the voltmeter, then:
a. A will decreases, V will increase
b. A will increase, V will decrease
c. Both A and V will increase
d. Both A and V will increase
Ans: (b)