Related Questions

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
A $${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months
B It will completely disintegrate in two months
C It will completely disintegrate in four months
D $${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months
When placed close together, two positively charged materials will
A Attract
B Become neutral
C Become negative
D Repel
Out of the following, which is not emitted by radioactive substance?
A Electrons
B Electromagnetic radiations
C Alpha particles
D Neutrons
Beta rays emitted by a radioactive material are
A The electrons orbiting around the nucleus
B Charged particles emitted by nucleus
C Neutral particles
D Electromagnetic radiations
__________ are not emitted by radioactive substances.
A α-rays
B β-rays
C Protons
D Positrons
240 radioactive grams of goo loses half its radioactivity every 10 days. How many grams of radioactive goo is left in 40 days?
A 120
B 60
C 15
D none
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?
A Sphere
B Cube
C Cylinder (L/D = 1)
D Raschig rings
Read both the statements and then mark your answer.Statement I: The government has recently fixed the fees for professional courses offered by the unaided institutions which are much lower than the fees charged last year.Statement II: The parents of the aspiring students launched a severe agitation last year protesting against the high fees charged by the unaided institutions.
A Statement I is the cause and Statement II is its effect
B Statement II is the cause and Statement I is its effect
C Both the Statement I and II are independent cause
D Both the Statement I and II are independent are effect of some common cause
The interest charged on a loan is Tk. p per Tk. 1,000 for the first month and Tk. q per Tk. 1,000 for each month after the first month. How much interest will be charged during the first three months on a loan of Tk. 10,000?
A 30p
B 30q
C 20p+10q
D 10p+20q
The interest charged on a loan is Tk. p per Tk. 1000 for the first month and Tk. q for the Tk. 1000 for each month after first month.How much interest will be charged during the first three months of a loan of Tk. 10000?
A 10p+20q
B p+2q
C 20p+10q
D 30q

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