International Physics Olympiad Qualifier – Grade – 12 www.olympiads.org Page 1 of 7 --------------------------------------------------------------------------------------------------------------- Max Marks: 60 Test ID: 13111 Time Allotted : 40 Mins --------------------------------------------------------------------------------------------------------------- Instructions: • Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct. • Each question carries 2 Marks. There is no negative marking 1. A voltmeter of resistance 1000 is connected across a resistance of 500 in the given circuit. What will be the reading of voltmeter? A. 1 V B. 2 V C. 6 V D. 4 V 2. A beam contains 2 10 8 doubly charged positive ions per cubic centimeter, all of which are moving with a speed of 10 5 m/s. The current density is A. 6.4 A/m 2 B. 3.2 A/m 2 C. 1.6 A/m 2 D. None of these 3. In the circuit shown, the reading of ammeter when switch S is open and when switch S is closed respectively are A. 3 A and 4 A B. 4 A and 5 A C. 5 A and 6 A D. 6 A and 7 A 4. In the circuit as shown in figure the |Grade: 12 | |International Physics Olympiad Qualifier| | Set: 2| V 50050010 V A 322S 20V 20101025V 0.5A R
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Grade: 12 | |International Physics ... - olympiads.org · International Physics Olympiad Qualifier – Grade – 12 Page 3 of 7 C. Both have the same speed in a medium D. They can
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International Physics Olympiad Qualifier – Grade – 12
www.olympiads.org
Page 1 of 7
--------------------------------------------------------------------------------------------------------------- Max Marks: 60 Test ID: 13111 Time Allotted : 40 Mins --------------------------------------------------------------------------------------------------------------- Instructions:
• Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
• Each question carries 2 Marks. There is no negative marking
1. A voltmeter of resistance 1000 is connected across a resistance of 500 in the given circuit. What will be the reading of voltmeter?
A. 1 V B. 2 V C. 6 V D. 4 V
2. A beam contains 2 108 doubly charged positive ions per cubic centimeter, all of which are moving with a speed of 105 m/s. The current density is
A. 6.4 A/m2 B. 3.2 A/m2 C. 1.6 A/m2 D. None of these
3. In the circuit shown, the reading of ammeter when switch S is open and when switch
International Physics Olympiad Qualifier – Grade – 12
www.olympiads.org
Page 4 of 7
B.
2X
Y
B
B
C. 2
1
X
Y
B
B
D. 4
1
X
Y
B
B
15. A fixed horizontal wire carries a current of 200 A. Another wire having a mass per
unit length mkg /10 2 is placed below the first wire at a distance of 2 cm and parallel
to it. How much current must be passed through the second wire if it floats in air without any support? What should be the direction of current in it
A. 25A (direction of current is same to first wire) B. 25A (direction of current is opposite to first wire) C. 49 A (direction of current is same to first wire) D. 49 A (direction of current is opposite to first wire)
16. Find magnetic field at O
A. r
i
24
5 0
B. r
i
24
0
C. r
i
24
11 0
D. Zero 17. A magnet is suspended horizontally in the earth's magnetic field. When it is
displaced and then released it oscillates in a horizontal plane with a period T. If a
place of wood of the same moment of inertia (about the axis of rotation) as the
magnet is attached to the magnet what would the new period of oscillation of the
system become
A. 3/T
B. 2/T
C. 2
T
D. 2T 18. Two short magnets of magnetic moment 1000 2Am are placed as shown at the corn
ers of a square of side 10 cm. The net magnetic induction at P is
International Physics Olympiad Qualifier – Grade – 12
www.olympiads.org
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A. 0.1 T B. 0.2 T C. 0.3 T D. 0.4 T
19. For characteristic X-ray of some material
A. )()()( KEKEKE
B. )()()( MELEKE
C. )()()( KKK
D. )()()( KLM
20. The maximum velocity of electrons emitted from a metal surface is V. When
frequency of light falling on it is f. The maximum velocity when frequency becomes
4f is
A. 2 V B. > 2 V C. < 2 V D. Between 2 V and 4 V
21. If the potential difference between the anode and cathode of the X-ray tube is
increases
A. The peaks at R and S would move to shorter wavelength B. The peaks at R and S would remain at the same wavelength C. The cut off wavelength at P would decrease D. B and C both are correct
22. The collector plate in an experiment on photoelectric effect is kept vertically above
the emitter plate. Light source is put on and a saturation photo current is recorded. An electric field is switched on which has a vertically downward direction
A. The photo current will increase B. The kinetic energy of the electrons will increase C. The stopping potential will decrease D. The threshold wavelength will increase