Physics Test 143

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Physics Test 143

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Weekly Quiz Competition

Question 1
4 / -1

Figure shows path followed by a particle and position of a particle at any instant. Four different students have represented the velocity vectors and acceleration vectors at the given instant. Which vector diagram can not be true in any situation? (In each figure velocity is tangential to the trajectory).

A
Sita

B
Gita

C
Ram

D
Shyam
Question 2
4 / -1

The mass and linear momentum in two systems of units are related as under: . All the symbols with subscript (1) belong to one system and all the symbols with subscript (2) belong to the other system. x and y are dimensionless constants. U₁ and U₂ are potential energies in two systems of units. Then

A

B

C

D

Solution

Units of K.E. and P.E. are same
Question 3
4 / -1

There are two bulbs B₁ (P, V), B₂ (P, 2V) their rated power and voltages are mentioned with them. Calculate the ratio of consumed power w₁ and w₂ ?

A
25/4

B
4/25

C
10/4

D
4/10

Solution
Question 4
4 / -1

Spherical shell A is made up of insulating material and carries electric charge uniformly distributed over its surface while Spherical shell B is made up of conducting material and carries no charge. C₁ and C₂ are centres of Shell A and Shell B respectively. Choose the correct statement :

A
electric field at centre C₂ of shell B due to charge of shell A is zero.

B
electric field at centre C₂ of shell B due to induced charges on surface of shell B is zero.

C
direction of electric field at point A on shell B due to induced charges on surface of shell B is radial.

D
direction of electric field at point P on shell B due to induced charges on surface of shell B is radial.

Solution

Net electric field should be normal to conductor's surface

Net electric field due to all the outside charges is zero inside a conducting shell
Question 5
4 / -1

What is the energy released in process

3 ₂He⁴ → ₆C¹²?

(Mass of ₂He⁴ = 4.002604 amu, mass of C¹² = 12 amu)

A
7.27 MeV

B
9.38 MeV

C
6.09 MeV

D
10.9 MeV

Solution

3 ₂He⁴ → ₆C¹²

Q = (3 × M_He – M_C) × c²

Q = 7.27 MeV
Question 6
4 / -1

The de-Broglie wave length of an electron in the n^th Bohr orbit is related to the radius R of the orbit as

A
nλ = πR

B

C
nλ = 2πR

D
nλ = 4πR

Solution

ℓ = 2πr = nλ
Question 7
4 / -1

Consider the nuclear fission reaction w → x + y. What is the Q-value (energy released) of the reaction ?

A
E₁N₁ – (E₂N₂ + E₃N₃)

B
(E₂N₂ + E₃N₃ – E₁N₁)

C
E₂N₂ + E₁N₁ – E₃N₃

D
E₁N₁ + E₃N₃ – E₂N₂
Question 8
4 / -1

An intrinsic semiconductor has a hole density of 10¹³ cm^–3 at room temperature. When doped with antimony, the hole density decreased to 10¹¹ cm^–3 at same temperature. The density of majority charge carriers will be :-

A
10⁹ cm^–3

B
10¹⁵ cm^–3

C
10¹¹ cm^–3

D
10¹³ cm^–3

Solution
Question 9
4 / -1

There is a prism with refractive index equal to √2 and the refracting angle equal to 30º. One of the refracting surfaces of the prism is polished. A beam of monochromatic light will retrace its path if its angle of incidence over the refracting surface of the prism is :

A
0º

B
30º

C
45º

D
60º
Question 10
4 / -1

An object starts moving at an angle of 45° with the principal axis as shown in the figure in front of a biconvex lens of focal length +10 cm. If θ denotes the angle at which image starts to move with principal axis then :

A

B

C

D