MET SERIES Physics
Decay Rate
11 previous year questions.
Volume: 11 Ques
Yield: Medium
High-Yield Trend
1
2020 1
2014 2
2013 2
2011 1
2010 2
2009 2
2008 Chapter Questions 11 MCQs
01
PYQ 2008
medium
physics ID: met-2008
The half-life of a radioactive element is 10 days. The time required for 75% of the element to decay is:
1
20 days
2
10 days
3
30 days
4
15 days
02
PYQ 2008
medium
physics ID: met-2008
A radioactive substance has a half-life of 60 min. During 3 hours, the fraction of the substance that has decayed is:
1
1/8
2
7/8
3
1/4
4
3/4
03
PYQ 2009
medium
physics ID: met-2009
The reaction involved in the oil of winter green test is salicylic acid + missing reagent product. The missing reagent in the above reaction is
1
phenol
2
NaOH
3
ethanol
4
methanol
04
PYQ 2009
medium
physics ID: met-2009
A covalent molecule has pyramidal structure. The number of lone pair and bond pair of electrons in the molecule are respectively
1
2 and 2
2
0 and 4
3
3 and 1
4
1 and 3
05
PYQ 2010
medium
physics ID: met-2010
A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. Calculate the minimum time after which it would be possible to work safely with this source.
1
12 h
2
24 h
3
6 h
4
130 h
06
PYQ 2011
medium
physics ID: met-2011
Rn decays into Po by emitting an -particle with half-life of 4 days. A sample contains atoms of Rn after 12 days, the number of atoms of Rn left in the sample will be:
1
2
3
4
07
PYQ 2011
medium
physics ID: met-2011
Decay constant of radium is . By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be:
1
2
more than
3
less than
4
zero
08
PYQ 2013
medium
physics ID: met-2013
A wet open umbrella is held vertical and it whirls about the handle at a uniform rate of 21 revolutions in . If the rim of the umbrella is a circle of in diameter and the height of the rim above the floor is , the locus of the drop is a circle of radius
1
2
3
4
09
PYQ 2013
medium
physics ID: met-2013
The moment of inertia of a body about a given axis is . To produce a rotational kinetic energy of an angular acceleration of must be applied for
1
2
3
4
10
PYQ 2014
medium
physics ID: met-2014
Fraction decayed in 6 days is . Find fraction decayed in 10 days.
1
2
3
4
11
PYQ 2020
medium
physics ID: met-2020
Half-life period of a radioactive substance is . Then amount of substance decayed in will be:
1
2
3
4
None of these
About Decay Rate - MET
Decay Rate is a vital chapter for MET aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Decay Rate PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Decay Rate carry the most weight. Then, tackle the questions iteratively to solidify your understanding.