Tag: physics

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Multiple choice physics scientists inventions and inventors in science indian scientist: biography and achievements scientist and their achievements

Scientists have found a way to develop camouflaging skin inspired by which species? 

  1. Octopus

  2. Cuttlefish

  3. Chameleon

  4. Only A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Scientists have studied both octopuses and cuttlefish for their remarkable ability to change skin color and texture for camouflage, leading to biomimetic developments.

Multiple choice physics scientists inventions and inventors in science indian scientist: biography and achievements scientist and their achievements

Which is the first law university in India?

  1. Al-Ameen College of law

  2. Alliance School of law

  3. R.K Law college

  4. National Law School of India
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The National Law School of India University is a public law school located in Bangalore, Karnataka is the first national law university established in India.

Multiple choice physics scientists inventions and inventors in science indian scientist: biography and achievements scientist and their achievements

$2$ December $1942$ is known for.

  1. The formation of the Big Bang theory

  2. The activation of the first operational nuclear reactor

  3. The creation of the first controlled chain reaction

  4. The development of the first thermonuclear device
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The world's first nuclear reaction, Chicago Pile-1 reached the stage of criticabty (ready for activation) on Dec'2 1942. The creation of 1st controlled chain reaction done on this day.

Multiple choice physics scientists inventions and inventors in science indian scientist: biography and achievements scientist and their achievements

Which is the first open university in India?

  1. Andhra Pradesh Open University

  2. Yashwantrao Chavan Maharashtra Open University

  3. Indira Gandhi National Open University

  4. Nalanda Open University
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Andhra Pradesh Government took the first initiative in 1982, to start the Andhra Pradesh Open University (now renamed Dr. BR Ambedkar Open University) at Hyderabad

Multiple choice physics scientists inventions and inventors in science indian scientist: biography and achievements scientist and their achievements

Who enunciated the principle of equipartition of energy?

  1. Ludwig Bolizmann

  2. Joseph Stefan

  3. Sir James Hopwood Jeans

  4. James Prescott Joule
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ludwig Boltzmann enunciated the principle of equipartition of energy, which states that energy is distributed equally among all degrees of freedom in thermal equilibrium. Joseph Stefan, Jeans, and Joule made other contributions to thermodynamics.

Multiple choice physics scientists inventions and inventors in science indian scientist: biography and achievements scientist and their achievements

He introduced a triatomic theory of colour vision, was the first to observe ocular astigmatism, he proved that the accommodation of eye was affected by change of curvature of the crystalline lens, but most famour for his discovery of interference of light and for developing the wave theory of light. Who was this physician-cum-physicist?

  1. Augustin Jean F. Fresnel

  2. Humphrey Lloyd

  3. Christiaan Huygens

  4. Thomas Young
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The triatomic theory of colour vision. The interference of light and for developing the wave theory of light. The physician -cum-physicist was Thomas Young.

Multiple choice physics reflection of light at curved surfaces problems on mirror and magnification formula derivation of formula for curved mirrors mirror formula and magnification

An object is placed at a distance of 1.5 m from a screen and a convex lens is interposed between them. The magnification produced is 4. The focal length of the lens is then

  1. 1 m

  2. 0.5 m

  3. 0.24 m

  4. 2 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Here, $m =\dfrac{v}{u} =-4$

$\Rightarrow u = \dfrac{-v}{4}$------------(1)

Also, $|u| + |v| = 1.5$

$\dfrac{v}{4} + v = 1.5$

$\Rightarrow \dfrac{(v+4 v)}{4} = 1.5$

 $\Rightarrow  v = 1.2 m$

So, putting the value of $v$ in equation (1):
 $u= \dfrac{-1.2}{4} = -0.3 m\,\,\,$

$\therefore  f =\dfrac{uv}{u-v}$

$\Rightarrow f=\dfrac{(-0.3 \times 1.2)}{(-0.3 - 1.2)} = 0.24m$
Hence the correct option is $(C)$