Physics Test 132

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Physics Test 132

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Weekly Quiz Competition

Question 1
4 / -1

In a transistor

A
the emitter has the least concentration of impurity

B
the collector has the least concentration of impurity

C
the base has the least concentration of impurity

D
all the three regions have equal concentrations of impurity
Question 2
4 / -1

A semiconducting device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops to almost zero. The device may be

A
an intrinsic semiconductor

B
a p-type semiconductor

C
an n-type semiconductor

D
a p-n junction
Question 3
4 / -1

The mass number of a nucleus is

A
always less than its atomic number

B
always more than its atomic number

C
equal to its atomic number

D
sometimes more than and somtimes equal to its atomic number
Question 4
4 / -1

Two protons are kept at a separation of 10 nm. Let F_n and F _ebe the nuclear force and the electromagnetic force between them.

A
F_e = F_n

B
F_e >> F_n

C
F_e << F_n

D
F_e and F_n differ slightly
Question 5
4 / -1

Ten grams of ⁵⁷Co kept in an open containg beta-decays with a half-life of 270 days. The weight of the material inside the container after 540 days will be very nearly

A
10 g

B
5 g

C
2.5 g

D
1.25 g
Question 6
4 / -1

A free neutron decays to a proton but a free proton does not decay to a neutron. This is because

A
neutron is a composite particle made of a proton and an electron whereas proton is a fundamental particle

B
neutron is an unchanged particle whereas proton is a charged particle

C
neutron has larger rest mass than the proton

D
weak forces can operate in a neutron but not a proton
Question 7
4 / -1

Magnetic field does not cause deflection in

A
alpha-rays

B
beta-plus rays

C
beta-minus rays

D
gamma rays
Question 8
4 / -1

Beta rays emitted by a radioactive material are

A
electromagnetic radiations

B
the electrons orbiting around the nucleus

C
charged particles emitted by the nucleus

D
neutral particles
Question 9
4 / -1

If elements with principle quantum number n>4 were not allowed in nature, the number of possible elements would be

A
60

B
32

C
4

D
64
Question 10
4 / -1

Consider the spectral line resulting from the transition n = 2 → n = 1 in the atoms and ions given below. The shortest wave length is produced by

A
Hydrogen atom

B
Deuterium atom

C
Singly ionized Helium

D
Doubly ionised Lithium

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Re-Attempt Weekly Quiz Competition

Physics Test 132

Result

Physics Test 132

Score

-

Rank

-

SHARING IS CARING

Question 1

the emitter has the least concentration of impurity

the collector has the least concentration of impurity

the base has the least concentration of impurity

all the three regions have equal concentrations of impurity

Question 2

an intrinsic semiconductor

a p-type semiconductor

an n-type semiconductor

a p-n junction

Question 3

always less than its atomic number

always more than its atomic number

equal to its atomic number

sometimes more than and somtimes equal to its atomic number

Question 4

Fe = Fn

Fe >> Fn

Fe << Fn

Fe and Fn differ slightly

Question 5

10 g

5 g

2.5 g

1.25 g

Question 6

neutron is a composite particle made of a proton and an electron whereas proton is a fundamental particle

neutron is an unchanged particle whereas proton is a charged particle

neutron has larger rest mass than the proton

weak forces can operate in a neutron but not a proton

Question 7

alpha-rays

beta-plus rays

beta-minus rays

gamma rays

Question 8

electromagnetic radiations

the electrons orbiting around the nucleus

charged particles emitted by the nucleus

neutral particles

Question 9

60

32

4

64

Question 10

Hydrogen atom

Deuterium atom

Singly ionized Helium

Doubly ionised Lithium

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My Perfomance

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Rank

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F_e = F_n

F_e >> F_n

F_e << F_n

F_e and F_n differ slightly