Physics Test 33

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Physics Test 33

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Weekly Quiz Competition

Question 1
4 / -1

The stable nucleus which has a radius half of Zn⁶⁴ is -

A
Ca⁴⁰

B
S¹⁶

C
Na²¹

D
Be⁸

Solution

r ∝ A^1/3
Question 2
4 / -1

For nuclear reaction :

₉₂U²³⁵ + ₀n¹ → ₅₆Ba¹⁴⁴ + ..........+3 ₀n¹

A
₂₆Kr⁸⁹

B
₃₆Kr⁸⁹

C
₂₆Sr⁹⁰

D
₃₈Sr⁸⁹

Solution

By balancing equation.

₉₂U²³⁵ + ₀n¹ → ₅₆Ba¹⁴⁴ + _ZX^A + 3 ₀n¹

Z = 92 – 56 = 36, A = 235 + 1 – 144 – 3 = 89
Question 3
4 / -1

The width of depletion region in PN–junction diode is 500 nm and an internal electric field is 6 × 10⁵ V/m. What is the kinetic energy which a conduction electron must have in order to diffuse from the N side to P side :-

A
0.03 eV

B
0.3 eV

C
0.45 eV

D
0.6 eV

Solution

E = V₀/ d ⇒ V₀ = Ed
= (6 × 10⁵) × (500 × 10^–9)
= 0.3 V
Question 4
4 / -1

When a resistance of 2 ohm is connected across the terminals of a cell, the current is 0.5 A. When the resistance is increased to 5 ohm, the current is 0.25 A. The e.m.f. of the cell is

A
1.0 V

B
1.5 V

C
2.0 V

D
2.5 V

Solution

Use E = I(R + r)

E= 0.5 (2 + r) ......(1)

E = 0.25 (5 + r) ......(2)

by eq (1) & (2) E = 1.5 V

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Re-Attempt Weekly Quiz Competition

Physics Test 33

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Physics Test 33

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Question 1

Ca40

S16

Na21

Be8

Solution

Question 2

26Kr89

36Kr89

26Sr90

38Sr89

Solution

Question 3

0.03 eV

0.3 eV

0.45 eV

0.6 eV

Solution

Question 4

1.0 V

1.5 V

2.0 V

2.5 V

Solution

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Ca⁴⁰

S¹⁶

Na²¹

Be⁸

₂₆Kr⁸⁹

₃₆Kr⁸⁹

₂₆Sr⁹⁰

₃₈Sr⁸⁹