Physics Test

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Physics Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

The weight of an object would be minimum when it is placed at?

A
north place

B
south place

C
equator

D
centre of the earth

Solution

The weight of an object would be minimum when it is placed at centre of the earth
Question 2
1 / -0

Which instrument is used for measuring relative humidity?

A
Barometer

B
Hydrometer.

C
Hygrometer

D
Manometer

Solution

A hygrometer is an instrument used to measure relative humidity. Humidity is the measure of the amount of moisture in the air. A psychrometer is an example of a hygrometer.
Question 3
1 / -0

The shape of a rain drop is spherical due to?

A
Viscosity

B
Surface tension

C
Elasticity

D
Gravitation

Solution

High surface tension binds the raindrop from all corners from inside and that is why the raindrop is spherical in shape
Question 4
1 / -0

How is temperature related to particles' motion?

A
Inversely proportional

B
Independent of each other

C
Directly proportional

D
Curvilinear relationship

Solution

Temperature is directly proportional to the particles' motion.

The temperature of matter tells us the average kinetic energy possessed by the particles. When we apply heat to matter, it gets absorbed and results in the particles having increased kinetic energy. This means that the particles were already in motion before, this kinetic energy results in greater motion.
Question 5
1 / -0

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is?

A
2

B
1

C
4

D
0.5

Solution

$\frac{1}{\lambda_{1}}=109678\left[\frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}}\right]$
lost balmer line
$\frac{1}{\lambda_{1}}=109678\left[\frac{1}{2^{2}}-\frac{1}{\infty}\right]$
last laymen line $\frac{1}{\lambda}=109678\left[1-\frac{1}{\infty}\right]$
$\lambda_{1}: \lambda_{2}=4$
Question 6
1 / -0

The SI unit of the universal gravitational constant G is?

A
N m²kg²

B
N m/kg

C
N kg/m

D
Nm²/kg²

Solution

The SI unit of the universal gravitational constant G is Nm²/kg²
Question 7
1 / -0

Radar is used to?

A
Locate submerged submarines

B
Receive signal from radio receivers

C
Detect and locate distant objects

D
Locate geostationary satellites

Solution

Radar is used to Detect and locate distant objects.Radar is a detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.
Question 8
1 / -0

The electric field intensity on the surface of a charged conductor is?

A
Zero

B
Directed normally to the surface

C
Directed tangentially to the surface

D
Directed along 45⁰ to the surface

Solution

The electric field intensity on the surface of a charged conductor is Directed normally to the surface.
Question 9
1 / -0

Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s]?

A
350 Hz

B
361 Hz

C
411 Hz

D
448 Hz

Solution

$f_{A} = f [\frac{V + V_{c}}{V - V_{s}}]$

$= 400 [\frac{340 + 16.5}{340 - 22}]$

$f_{A} = 448 H z$
Question 10
1 / -0

The acceleration due to gravity is:

A
Maximum at the centre of the earth

B
Negative at the centre of the earth

C
Positive at the centre of the earth

D
Zero at the centre of the earth
Solution
The acceleration due to gravity is zero at the centre of the earth.

Acceleration Due to Gravity:
- The force of attraction exerted by the earth on a body is called gravitational pull or gravity.
- We know that when a force acts on a body, it produces acceleration. Therefore, a body under the effect of gravitational pull must accelerate.
- The acceleration produced in the motion of a body under the effect of gravity is called acceleration due to gravity, it is denoted by g.
The acceleration due to gravity below the surface of the earth is given as,

$g_{d}=g\left(1-\frac{d}{R}\right)\quad\dots(1)$

Where $g_{d}=$ acceleration due to gravity at depth $d$ from the surface of the earth, $g=$ acceleration due to gravity on the surface of the earth, and $R=$ radius of the earth

At the center of the earth,

${d}={R}$

So, by equation (1),

$g_{d}=g\left(1-\frac{R}{R}\right)$

$\Rightarrow g_{d}=g(1-1)$

$\Rightarrow g_{d}=0$

$\therefore$ The acceleration due to gravity is zero at the centre of the earth.

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Physics Test - 2

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Physics Test - 2

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Question 1

north place

south place

equator

centre of the earth

Solution

Question 2

Barometer

Hydrometer.

Hygrometer

Manometer

Solution

Question 3

Viscosity

Surface tension

Elasticity

Gravitation

Solution

Question 4

Inversely proportional

Independent of each other

Directly proportional

Curvilinear relationship

Solution

Question 5

2

1

4

0.5

Solution

Question 6

N m2kg2

N m/kg

N kg/m

Nm2/kg2

Solution

Question 7

Locate submerged submarines

Receive signal from radio receivers

Detect and locate distant objects

Locate geostationary satellites

Solution

Question 8

Zero

Directed normally to the surface

Directed tangentially to the surface

Directed along 450 to the surface

Solution

Question 9

350 Hz

361 Hz

411 Hz

448 Hz

Solution

Question 10

Maximum at the centre of the earth

Negative at the centre of the earth

Positive at the centre of the earth

Zero at the centre of the earth

Solution

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N m²kg²

Nm²/kg²

Directed along 45⁰ to the surface