Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 76

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Weekly Quiz Competition

Question 1
4 / -1

If a hydrogen atom emits a photon of wave length, the recoil speed of the atom of mass m is given by

A

B

C

D

Solution
Question 2
4 / -1

A freshly prepared radio active source of half time 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which is would be possible to work safely with this source is.

A
6 h

B
24 h

C
12 h

D
36 h

Solution
Question 3
4 / -1

In Rutherford experiment, the numer of Particles sccttered at 90^o angle are 28 per min. Then the number of particles at the angle 1200 in per min will be

A
25

B
12.0

C
50

D
112

Solution
Question 4
4 / -1

The Rutherford revolution per second made by an electron in the first Bohr orbit of hydrogen atom is of the order of

A
10¹⁵

B
10²⁰

C
10¹⁰

D
10¹⁹

Solution
Question 5
4 / -1

The half time of a radioactive substance is 20 min, difference between points of time when it is 33% disintegrated and 67% disseminated is approximately

A
10 min

B
20 min

C
40 min

D
30 min

Solution
Question 6
4 / -1

The size of the atom is of the order of

A
10^–14 m

B
10^–10 m

C
10^–8 m

D
10^–5 m
Question 7
4 / -1

The size of the nucleus is of the order of

A
10^–10 m

B
10^–14 m

C
10^–19 m

D
10^–3 m
Question 8
4 / -1

The ratio of atomic volume of nuclear volume is of the order of

A
10^–15

B
10^–10

C
10¹⁵

D
10^–10

Solution
Question 9
4 / -1

Plutonium decays with half life time 24000 yer. if Plutonium is stored after 72000 yes, the fraction of it that remain

A

B

C

D

Solution
Question 10
4 / -1

The radio of minimum to maximum wave length in Balmer series is

A

B

C

D

Solution