Physics Test 148

Result

Physics Test 148

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

Figure shows the transfer characteristics of a base biased CE transistor. Which of the following statement is false?

A
At V_i = 0.4 V, transistor is in active state

B
At V_i = 1V, it can be used as an amplifier

C
At V_i = 0.5 V, it can be used as a switch turned off

D
At V_i = 2.5 V,it can be used as a switch turned on
Question 2
4 / -1

A photoelectric cell is connected to a source of variable potential difference, connected across it and the photoelectric current resulting (µA) is plotted against the applied potential difference (V). The graph in the broken line represents one for a given frequency and intensity of the incident radiation. If the frequency is increased and the intensity is reduced, which of the following graphs of unbroken line represents the new situation ?

A
A

B
B

C
C

D
D

Solution

Intensity reduced, current reduced, frequency increased, stopping potential increased.
Question 3
4 / -1

When a metal is irradiated by light having wavelength λ (λ < λ₀), all the photoelectron emitted are bent in a circle of radius r by a magnetic of flux density B₀. Find the (1 / λ₀), where λ₀ is threshold wavelength.

A

B

C

D
None of these

Solution
Question 4
4 / -1

For the given diagram when block B is pulled with velocity V then velocity of block A will be :-

A
V

B
V/√3

C
V√3

D
Question 5
4 / -1

From the homogeneous square plate we cut a triangle (Figure). Side of the square is a and. the apex of the triangle is at the center of the square. Distance from the center of the square to the center of mass of the remainder of the plate is :

A
a/5

B
a/3

C
a/6

D
a/9

Solution
Question 6
4 / -1

A square of side a is cut from a square of side '2a' as shown mass of this square with hole is M. Then its moment of inertia with respect to an axis passing through centre of mass and perpendicular to its plane will be :-

A
Ma² / 6

B
2Ma² / 6

C
4Ma² / 6

D
5Ma² / 6
Question 7
4 / -1

A body, under the action of a force acquires an acceleration of 1 m/s². The mass of this body must be :-

A
10 √2 kg

B
2 √10 kg

C
10 kg

D
20 kg
Question 8
4 / -1

Two substances A and B of equal mass m are heat uniform rate of 6 cal s^–1 under similar conditions. A graph between temperature and time is shown in figure. Ratio of heat absorbed H_A/H_B by them for complete fusion is

A
9/4

B
4/9

C
8/5

D
5/8

Solution
Question 9
4 / -1

The coefficient of linear expansion of steel and brass are 11 × 10^–6/°C and 19 × 10^–6/°C respectively. If their difference in lengths at all temperatures has to be kept constant at 30 cm, their lengths at 0°C should be :-

A
71.25 cm and 41.25 cm

B
82 cm and 52 cm

C
92 cm and 62 cm

D
62.25 cm and 32.25 cm

Solution
Question 10
4 / -1

A shown in the figure, the amount of heat absorbed along the path ABC is 90J and the amount of work done by the system is 30 J. If the amount of work done along the path ADC is 20 J the amount of heat absorbed will be :-

A
80 J

B
90 J

C
110 J

D
120 J

Solution

Path ABC,

dQ = dU + dW

90 = dU + 30

dU = 60 Joule

Path ADC,

dQ = dU + dW

= 60 + 20 = 80 Joule