1
TS EAMCET 2020 (Online) 10th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The half-life of a radioactive sample is 5 s . If the initial mass of the sample is 60 g , then the time required to reduce the sample to 7.5 g is

A

15 s

B

75 s

C

7.5 s

D

10 s

2
TS EAMCET 2020 (Online) 10th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The nuclear forces are

A

long range repulsive forces

B

long range attractive forces

C

short range attractive forces

D

short range repulsive forces

3
TS EAMCET 2020 (Online) 10th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of maximum to minimum wavelength in Balmer series of an hydrogenic atom is

A

$9 / 5$

B

$12 / 7$

C

$9 / 7$

D

$14 / 9$

4
TS EAMCET 2020 (Online) 10th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Alpha rays emitted from a radioactive substance are

A

negatively charged particles

B

doubly ionised helium atoms

C

ionised hydrogen nuclei

D

uncharged particles

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