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Quiz 73
Mdcat-past-papers Quiz
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1441. The unit of decay constant is;
m
s
s^-1
m^-1
1442. Half life of a radioactive sample is given by:
T1/2 = λ / (0.693)
T1/2 = (0.693) / λ
T1/2 = (0.693)λ
T1/2 = √(0.693)
1443. In beta positive decay, the nuclear number is;
Conserved
Not conserved
Unstable
Stable
1444. Half life of radon gas is:
3.8 minutes
3.8 days
3.8 months
38 years
1445. When two negative Beta particles are emitted from a nucleus then the mass number :
No change
Increases by 2
Increases by 1
Increases by 3
1446. A 40 gm radioactive material is placed in a chamber, having a half-life of 20 days. How much will be left after 80 days :
40 gm
5 gm
2.5 gm
2.5 gm
1447. Which of the following electromagnetic radiation has the highest penetrating power ?
Alpha rays
Gamma rays
Beta rays
Proton rays
1448. Which photon carries the most energy?
Blue
Violet
Red
Green
1449. Which x-ray photon will have longest wavelength?
K-alpha
K-beta
K-gamma
All have equal energy
1450. The half-life of Iodine-131 is:
10 days
8 days
45 days
60 days
1451. The half-life of carbon is 5730 years. How much carbon will left after 22920 years?
1/32th
1/16th
1/64th
1/4th
1452. He represents:
A-rays
β-rays
γ-rays
X-rays
1453. The half life of Iodine-31 is:
10 days
8 days
45 days
60 days
1454. The relation between the decay constant λ and the half-life T₁/₂ is:
T₁/₂ = 0.693/λ
λ = T₁/₂ / 0.693
T₁/₂ = λ / 0.693
λ = T₁/₂ × 0.693
1455. 1 becquerel is equal to:
One decay per second
Two decays per second
Three decays per second
Four decays per second
1456. The half life of a radioactive sample predicts about:
Whole life of sample
Disintegration time of half number of atoms
Decay only
Total time for stable atoms
1457. Radioactivity does not depend upon:
Initial number of atoms
Temperature
Nature of material
Time
1458. The radiation emitted by warm-blooded animals lies in the region of:
Visible
Ultraviolet
Infrared
X-rays
1459. An electron will have maximum kinetic energy when it has:
Long wavelength
Short wavelength
Low frequency
Circular motion
1460. At the end of 14 minutes, 1/16 of a sample of radioactive polonium remains. The corresponding half-life is:
7/8 min
8/7 min
7/4 min
7/2 min
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