Physical World Test

Result

Physical World Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

When TC for zero level of output is $$60$$, it is the value of _________.

A
AFC

B
TLC

C
MC

D
TVC

Solution

$$\text { At zero level of out put } T C=T L C$$
Question 2
1 / -0

The shortest range of the fundamental force is associated with

A
strong nuclear force

B
gravitational force

C
electromagnetic force

D
weak nuclear force

Solution

$$\begin{array}{l}\text { Strong nuclear force has the shortest range inall } \\\text { fundamental forces. }\end{array}$$
Question 3
1 / -0

Vikram Sarabhai's pHD thesis was titled _______.

A
Cosmic Ray studies in Gold Mines

B
Cosmic Ray Investigations in Tropical Latitudes

C
Gamma Ray Studies in Outer Space

D
Gamma Ray Studies in Tropical Areas.

Solution

Vikram Sarabhai passed the intermediate Science examination from the Gujarat College in Ahmedabad and went to England for further studies.
He enrolled at the St. John's College, University of Cambridge from where he received the Tripos in Natural Sciences in 1940. After coming back to India, he joined the Indian Institute of Science in Bangalore.
He wanted to conduct research on cosmic rays, which was something he undertook on the advice of the eminent scientist C.V. Raman. His first scientific paper 'Time Distribution of Cosmic Rays' was published in 1942.
He returned to Cambridge in 1945 to further his research on cosmic rays and earned his PhD for his thesis 'Cosmic ray investigations in tropical latitudes'.
So, the correct option is 'Cosmic Ray Investigations in Tropical Latitudes'.
Question 4
1 / -0

The enhanced force of cohesion in metals is due to

A
The covalent linkages between atoms

B
The exchange energy in mobile electron

C
The lack of exchange of valence electrons

D
The delocalization of valence electron between metallic kernels.

Solution

$$\begin{array}{l}\text { The enhanced force of cohesion in metals is due to } \\\text { exchange energy in mobile electron (delocalised valance } \\\text { electrons between metallic kernels. }\end{array}$$
Question 5
1 / -0

Which of the following is not correct about nuclear forces?

A
They are the short-range attractive force

B
They are independent of charge.

C
They change repulsion at very close distance

D
the obey inverse square law

Solution

$$\begin{array}{l}\text { Inshort range that is less than } 0.7 \mathrm{fm} \text { the nuclear force } \\\text { becomes repulsive. }\end{array}$$
Question 6
1 / -0

On a summer morning at $$6$$ am, a honey bee located a nectar source in the same direction as the rising sun. It went back to the hive and performed a waggle dance which lasted for several hours. What will be the direction of the waggle dance at $$6$$ pm?

A

B

C

D

Solution
Question 7
1 / -0

Which among the following has the strongest intermolecular force between their molecules?

A
Milk

B
Water

C
Sodium chloride

D
Air

E
None of these

Solution

$$\begin{array}{l}\text { NaCl particle's, Air have weak Vander waal forces } \\\text { Liquids have greater force than NaCl and air. } \\\text { Since water forms hydrogen bonds intermolecular }\end{array}$$
$$\begin{array}{l}\text { force in water is high compared to milk. } \\\text { So water has the strongest enter molecular force } \\\text { between the air molecules. }\end{array}$$
Question 8
1 / -0

What Benjamin Franklin invented?

A
Bifocal spectacles

B
Radio

C
Barometer

D
Hygrometer

Solution

Benjamin Franklin Invented Bifocal spectacle in 1760. Benjamin Franklin's had poor vision and needed glasses to read. He got tired of constantly taking them off and putting them back on, so he decided to figure out a way to make his glasses let him see both near and far. He had two pairs of spectacles cut in half and put half of each lens in a single frame. Today, we call them bifocals.
Question 9
1 / -0

In which of the following layers of the atmosphere most of the ozone is present ?

A
Troposphere

B
Exosphere

C
Mesosphere

D
Stratosphere

E
None of these

Solution

Ozone is present throughout the lower atmosphere (troposphere and stratosphere). Most ozone resides in the stratospheric “ozone layer” above Earth's surface.
Question 10
1 / -0

Forces of adhesion are caused due to :

A
Magnetic attractions

B
Gravitational attractrons

C
Electrostatic attractions

D
Frictional forces

Solution