Physics Test

Result

Physics Test - 5

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Weekly Quiz Competition

Question 1
4 / -1

A particle acted on by constant forces

The total work done by the forces is

A
20 units

B
30 units

C
40 units

D
50 units

Solution
Question 2
4 / -1

The figure shows three spherical and equipotential surfaces A, B and C around a point charge q. The potential difference V_A- V_B = V_B - V_C. If t₁ and t₂ are the distances between them, then

A
t₁ = t₂

B
t₁> t₂

C
t₁ < t₂

D
No relation between t₁& t₂

Solution
Question 3
4 / -1

The resistance of bulb filament is 100W at a temperature of 100°C. If its temperature coefficient of resistance is 0.005 per °C, its resistance will become 200 W at a temperature (°C) of _____.

A
200

B
100

C
150

D
300

Solution

100 = R₀(1 + 0.005 × 100) -------- (i)

200 = R₀(1 + 0.005 × t) --------- (ii)

Dividing (i) by (ii) and solving

t = 200 °C
Question 4
4 / -1

A
60^o

B
45^o

C
30^o

D
90^o

Solution
Question 5
4 / -1

A particle moves towards east from a point A to a point B at the rate of 4 km/h and then towards north from B to C at rate of 5 km/h. If AB = 12 km and BC = 5 km, then its average speed for its journey from A to C and resultant average velocity direct from A to C respectively are

A

B

C

D

Solution
Question 6
4 / -1

The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the

A
crystal structure

B
variation of the number of charge carriers with temperature

C
type of bonding

D
variation of scattering mechanism with temperature

Solution

There are different charge carriers in case of a metal and a semiconductor. Resistance depends upon the number of charge carriers present. So, resistance variation is there due to charge carrier variation.
Question 7
4 / -1

Which of the following is used for making the filaments of electric bulbs?

A
Copper

B
Nichrome

C
Tungsten

D
None of these

Solution

Tungsten has the highest melting point, that's why it is used for making bulb filaments .
Question 8
4 / -1

An alien is celebrating his 4^thbirthday on his home planet, which is at a distance of 4 AU from the sun. What is the age of the alien in terrestrial years?

A
1 year

B
16 years

C
32 years

D
None of these

Solution
Question 9
4 / -1

Two batteries 8V and 4V with respective internal resistances 4Ω and 8Ω are connected in parallel as shown in the circuit. When switch S is closed, then

A
both the batteries are getting charged.

B
8 V battery is discharging and 4 V battery is charging

C
both batteries are getting discharged

D
4 V battery is discharging and 8 V battery is charging

Solution

So from both the batteries current is coming out, so both batteries are discharging
Question 10
4 / -1

Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is

A

B

C

D

Solution