KARNATAKA CET PHYSICSâ2000
2000
KARNATAKA CET PHYSICS‐2000 www.vinuthetutor.com
KARNATAKA CET PHYSICS‐2000 1. A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the wire becomes a.
b.
R n R n 4
c. nR d.
R n 2
2. If the energy released in the fission of one nucleus is 200 MeV, then number of nuclei required per second in a power plant of 16 kW is a. 0.5 x 12 12 b. 5 x 10 14 c. 0.5 x 12 14 d. 5 x 10 12 3. If R is Rydberg constant for hydrogen, the wavenumber of the first line in the Lyman series is a.
3 R 4
b. 2R c.
d.
R 4 R 2
4. A and B are two concentric circular conductors of center O and carrying currents I1 and I2 as shown in the adjacent figure. If ratio of their radii is 1: 2 and ratio of the flux densities at O due to A and B is 1 : 3, then the value of I1/I2 is
a.
b.
c.
d.
1 3 1 6 1 2 1 4
5. The impurity atom that should be added to germanium to make it ntype is a. arsenic b. iodine
2
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KARNATAKA CET PHYSICS‐2000 c. aluminium d. indium 6. After an interval of one day, 1/16 th of the initial amount of a radioactive material remains in a sample. Its halflife is a. 3 hr b. 12 hr c. 2 hr d. 6 hr 7. The magnetic flux linked with a coil, in weber, is give by the equation F = 3t
2
+ 4t + 9 . The
magnitude of induced e.m.f. at t = 2 second is a. 4 V b. 16 V c. 3 V d. 9 V 8. The relation between a.
a=
b.
a=
c.
a=
d.
a=
a
and
b
parameters of a transistor is given by
b 1+ b 1+ b
b b 1- b 1- b
b
9. An example of a diamagnetic substance is a. copper b. aluminium c. iron d. nickel 10. The energy that should be added to an electron, to reduce its deBroglie wavelength from 10 10 m to 0.5 x 10 10 a. thrice the initial energy b. equal to the initial energy c. four times the initial energy d. twice the initial energy 11. An electron of mass m and charge q is travelling with a speed v along a circular path of radius r at right angles to a uniform of magnetic field B. If speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius a. 2r b.
r 4
c. 4r d.
r 2
12. Two resistances r1 and r2 (r1
KARNATAKA CET PHYSICS‐2000 www.vinuthetutor.com
KARNATAKA CET PHYSICS‐2000 1. A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the wire becomes a.
b.
R n R n 4
c. nR d.
R n 2
2. If the energy released in the fission of one nucleus is 200 MeV, then number of nuclei required per second in a power plant of 16 kW is a. 0.5 x 12 12 b. 5 x 10 14 c. 0.5 x 12 14 d. 5 x 10 12 3. If R is Rydberg constant for hydrogen, the wavenumber of the first line in the Lyman series is a.
3 R 4
b. 2R c.
d.
R 4 R 2
4. A and B are two concentric circular conductors of center O and carrying currents I1 and I2 as shown in the adjacent figure. If ratio of their radii is 1: 2 and ratio of the flux densities at O due to A and B is 1 : 3, then the value of I1/I2 is
a.
b.
c.
d.
1 3 1 6 1 2 1 4
5. The impurity atom that should be added to germanium to make it ntype is a. arsenic b. iodine
2
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KARNATAKA CET PHYSICS‐2000 c. aluminium d. indium 6. After an interval of one day, 1/16 th of the initial amount of a radioactive material remains in a sample. Its halflife is a. 3 hr b. 12 hr c. 2 hr d. 6 hr 7. The magnetic flux linked with a coil, in weber, is give by the equation F = 3t
2
+ 4t + 9 . The
magnitude of induced e.m.f. at t = 2 second is a. 4 V b. 16 V c. 3 V d. 9 V 8. The relation between a.
a=
b.
a=
c.
a=
d.
a=
a
and
b
parameters of a transistor is given by
b 1+ b 1+ b
b b 1- b 1- b
b
9. An example of a diamagnetic substance is a. copper b. aluminium c. iron d. nickel 10. The energy that should be added to an electron, to reduce its deBroglie wavelength from 10 10 m to 0.5 x 10 10 a. thrice the initial energy b. equal to the initial energy c. four times the initial energy d. twice the initial energy 11. An electron of mass m and charge q is travelling with a speed v along a circular path of radius r at right angles to a uniform of magnetic field B. If speed of the electron is doubled and the magnetic field is halved, then resulting path would have a radius a. 2r b.
r 4
c. 4r d.
r 2
12. Two resistances r1 and r2 (r1
