Which of the following is correct?

Atleast three geostationary satellite in the same orbit around the earth can cover the whole part of the earth for microwave communication

A single geostationary satellite can cover the whole part of the earth for microwave communication

The correct Option is "Atleast three geostationary satellites in the same orbit around earths can cover the whole part of the earth for microwave communication"

The first Indian communication satellite is Apple

The satellite communication is not like the line of sight microwave communication.

Which of the following is correctly sequenced?

The system by which various taxonomic categories are arranged in a proper descending order is called taxonomic or systematic hierarchy. The correct sequence of categories in systematic hierarchy is- Kingdom, sub-kingdom, division or phylum, class, sub-class, series, order, family, genus, species.

The correct Option is "Phylum, class, order, family"

Which of the following is correctly matched?

$\frac{1}{\lambda } = R\left[ {\frac{1}{{{1^2}}} - \frac{1}{{{2^2}}}} \right] = \frac{{3R}}{4}$ , $\lambda = \frac{h}{p}$ , $P = \frac{h}{\lambda } = h \times \frac{{3R}}{4} = \frac{{3Rh}}{4}$

The correct Option is "Momentum of H atom when electrons return from n=2 to n=1: $\frac{{3Rh}}{4}$"

Momentum of photon : Independent of wavelength of light

e/m ratio of anode rays : Independent of gas in the discharge tube

Radius of nucleus ${\left( {{\rm{Mass\;no}}.} \right)^{1/2}}$

Which of the following is correct the ploidy level in labelled organs of plant shown in given figure?

Sporophyte - Diploid (2n) Antheridia – Haploid (n) Rhizoids - Haploid (n)

The correct Option is "All of the above"

Which of the following is correct order of increasing size?

The correct Option is "${\rm{B}}{{\rm{r}}^ - } > {{\rm{S}}^{2 - }} > C{{\rm{l}}^ - } > N{{\rm{a}}^ + } > M{{\rm{g}}^{2 + }} > B{{\rm{e}}^{2 + }}$"

${\rm{B}}{{\rm{e}}^{2 + }} > \;M{{\rm{g}}^{2 + }} > {\rm{\;N}}{{\rm{a}}^ + } > {{\rm{S}}^{2 - }} > {\rm{C}}{{\rm{l}}^ - } > {\rm{B}}{{\rm{r}}^ - }$

${{\rm{S}}^{2 - }} > {\rm{\;C}}{{\rm{l}}^ - } > B{{\rm{r}}^ - } > {\rm{N}}{{\rm{a}}^ + } > {\rm{M}}{{\rm{g}}^{2 + }} > {\rm{B}}{{\rm{e}}^{2 + }}$

${\rm{N}}{{\rm{a}}^ + } > {\rm{M}}{{\rm{g}}^{2 + }} > {\rm{B}}{{\rm{e}}^{2 + }} > {\rm{B}}{{\rm{r}}^ - } > {\rm{C}}{{\rm{l}}^ - } > {{\rm{S}}^{2 - }}$

For electron affinity of halogens, which of the following is correct?

The order of electron affinity among the halogens is ${\rm{Cl}} > F > Br > I$

The correct Option is "${\rm{Br\;}} < \;Cl\;$"

Which of the following is correctly matched?

Wallago attu (malhi) is a cat fish.

The correct Option is "Wallago attu – Cat fish"

Which of the following is correct matched?

Sulphur and phosphorus cycle are sedimentary cycle.

Rhizobium – Free-living nitrogen fixer

The correct Option is "Phosphorus cycle – Sedimentary"

Shorea robusta – Tropical deciduous forest

Which of the following is correct in case of chemical synapses? I. The membranes of the pre and postsynaptic neurons are separated by a gap called synaptic cleft II. Chemicals called neurotransmitters are involved in the transmission of impulses III. Impulse transmission in chemical synapse is faster than that across an electrical synapse IV. Chemical synapses are rare in our system

A nerve impulse is transmitted from one neuron to another through junctions called synapses. A synapse is formed by the membranes of a presynaptic neuron and a postsynaptic neuron, which may or may not be separated by a gap called synaptic cleft There are two types of synapses, i.e., electrical synapses and chemical synapses. At electrical synapses, the membrane of pre- and postsynaptic neurons are in very close proximity. Electrical current can flow directly from one neuron into the other across these synapses Transmission of an impulse across electrical synapses is very similar to impulse conduction along a single axon. Impulse transmission across an electrical synapse is always faster than the across a chemical synapse. Electrical synapses are rare in our system At a chemical synapse, the membranes of the pre- and postsynaptic neurons are separated by fluid-filled space called synaptic cleft. Chemicals called neurotransmitters are involved in the transmission of impulses at these synapses

The correct Option is "I and II"

The nervous tissue forms the nervous system in animals. Which of the following is correct about its origin?

Nervous tissue forms the nervous system in animals. It is ectodermal in origin

The correct Option is "Ectodermal"

Given ${\rm{\vec A}} = 4\hat i + 6\hat j\,and\,{\rm{\vec B}} = 2\hat i + 3\hat j$. Which of the following is correct?

${\rm{\vec A}} \times {\rm{\vec B}} = \left( {4\hat i + 6\hat j{\rm{\;}}} \right) \times \left( {2\hat i + 3\hat j{\rm{\;}}} \right) = 12\left( {\hat i \times \hat j{\rm{\;}}} \right) + 12\left( {\hat j \times \hat i{\rm{\;}}} \right) = 12\left( {\hat i \times \hat j{\rm{\;}}} \right) - 12\left( {\hat i \times \hat j{\rm{\;}}} \right) = 0$ Again, ${\rm{\vec A}}{\rm{.\vec B}} = \left( {4\hat i + 6\hat j{\rm{\;}}} \right).\left( {2\hat j + 3\hat i{\rm{\;}}} \right) = 8 + 18 = 26$ Again, $\frac{{\left| {{\rm{\vec A}}} \right|}}{{\left| {{\rm{\vec B}}} \right|}} = \frac{{\sqrt {16 + 36} }}{{\sqrt {4 + 9} }} \ne \frac{1}{2}$ Again , ${\rm{\vec B}} = \frac{1}{2}{\rm{\;\vec A}}$

The correct Option is "${\rm{\vec A}} \times {\rm{\vec B}} = \vec 0$"

${\rm{\vec A}}{\rm{.\vec B}} = 24$

$\frac{{\left| {{\rm{\vec A}}} \right|}}{{\left| {{\rm{\vec B}}} \right|}} = \frac{1}{2}$

${\rm{\vec A\;}}\,and\,{\rm{\vec B}}$ are anti-parallel

Which of the following is correct for a reaction to be spontaneous?

$\Delta G = \Delta H - T\Delta S\,\,\,For\,\,spon\tan eity\,\,\Delta G = - ve\,\,\Delta S = + ve\,\,\Delta H = - ve$

$\Delta G = + ve,\,\,\Delta H = + ve$

The correct Option is "$\Delta H = - ve,\,\,\Delta S = + ve$"

$\Delta G = + ve,{\mkern 1mu} {\mkern 1mu} \Delta H = - ve$

$\Delta H = + ve,\,\,\Delta S = - ve$

Which of the following is correct

Diabetes is a sugar disease so, advised to patient of diabetes to eat sugar free food. Blood cancer is known as leukaemia.

The correct Option is "Diabetes - Sugar free"

Rheumatic fever - Defective pacemaker

Heart attack - Radiation therapy

Which of the following is correct for middle lamella of eukaryotic cell?

All the given statements are correct

It is formed as a cell plate during cytokinesis

It is mainly consists of Ca-pectate

It holds different neighbouring cells together

The correct Option is "All of the above"

Gases deviate from ideal gas behaviour at high pressure. Which of the following is correct for non ideality?

A fact for deviations from ideal gas behaviour.

At high pressure, the collision between the gas molecules becomes enormous

At high pressure, the gas molecules move only in one direction

At high pressure, the volume of gas becomes insignificant

The correct Option is "At high pressure, the intermolecular interaction become significant"

Which of the following is correct about Neela Kuranji?

All are correct Strobilanthus kunthiana also called Neela Kuranji in local language. It is found in Kerala, Maharashtra, Tamil Nadu. It reproduce once in 12 yr Last time it was reproduced in Sept-Oct, 2006 and produced blue flower in massive quantity. It attracted tourist because all of the area appeared blue

Last time it was flowered in Sept-Oct.2006

Next time it will have flower in Sept-Oct.2018

It is found in Kerala, Tamil Nadu and Karnataka

The correct Option is "All of the above"

Which of the following is correct? I. Wine and beer are produced without distillation of fermented broth II. Whisky, brandy and rum are produced by distillation of the fermented broth III. Wine and beer are produced by distillation of the fermented broth IV. Whisky, brandy and rum are produced without distillation of the fermented broth Choose the correct option

Wine and beer are produced without distillation of fermented broth Whisky, brandy and rum are produced by distillation of the fermented broth

The correct Option is "I and II"

Which of the following is correctly matched?

(1) Central Rice Research Institute - Cuttack (2) National Botanical Research Institute – Lucknow (3) Central Drug Research Institute – Lucknow (4) Central Food Technology Research Institute - Mysore

Central Rice Research institute – Shimla

National Botanical Research Institute – Delhi

Central Drug Research Institute - Cuttack

The correct Option is "Central Drug Technology Research Institute – Mysore"

Which of the following is correctly matched?

Agrobacterium tumefaciens (updated scientific name Rhozobium radiobacter) is the casual agent of crown gall disease (the formation on tumour) in over 140 species of dicot. It is a rod-shaped, Gram negative, soil bacterium (Smith, et. al 1907). Symptoms are caused by the insertion of a small segment of DNA, known as T-DNA (transfer DNA) into the plant cell, which is incorporated at a semi-random location into the plant genome

The correct Option is "Agrobacterium tumefaciens – Tumour"

Which of the following is correct for an ideal gas :

Internal energy of an ideal gas is function of temperature and thus ${\left( {\frac{{\partial E}}{{\partial P}}} \right)_T}$= 0

${\left( {\frac{{\partial E}}{{\partial T}}} \right)_V}$= 0

The correct Option is "${\left( {\frac{{\partial E}}{{\partial P}}} \right)_T}$= 0"

$\;{\left( {\frac{{\partial E}}{{\partial T}}} \right)_P}$= 0

Which of the following is correct about mammalian testes?

Sertoli’s cells, seminiferous tubules and Leydig’s cells, all are present in testes, while Graafian follicles are present in ovary of mammals.

Graafian follicles, sertoli’s cells, Leydig’s cells

Graafian follicles, sertoli’s cells, seminiferous tubules

The correct Option is "Sertoli’s cells, seminiferous tubules, Leydig’s cells"

Graafian follicles, Leydig’s cells, seminiferous tubules

Which of the following is correct?

${\rm{S}}{{\rm{F}}_6}$ does not obey octet rule as in it $S - $ atom has 12 electrons in its valence shell.

The correct Option is "The number of electrons present in the valence shell of $S$ in ${\rm{S}}{{\rm{F}}_6}$is 12."

The rates of ionic reactions are very low.

According to VSEPR theory, ${\rm{SnC}}{{\rm{I}}_2}$ is a linear molecule.

The correct order of ability to form ionic compounds among ${\rm{N}}{{\rm{a}}^ + },{\rm{M}}{{\rm{g}}^{2 + }}$ and ${\rm{A}}{{\rm{l}}^{3 + }}$ is ${\rm{A}}{{\rm{l}}^{3 + }} > M{{\rm{g}}^{2 + }} > N{{\rm{a}}^ + }$.

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition?

The correct Option is "q=0,∆T=0,w=0"

Which of the following is correct?

Alkali metals are electropositive, hence they can reduce ${\rm{C}}{{\rm{O}}_2}$ . $4{\rm{Na}} + {\rm{C}}{{\rm{O}}_2} \to 2{\rm{N}}{{\rm{a}}_2}{\rm{O}} + {\rm{C}}$

In the Castner’s process of sodium extraction, NaCl is used as an electrolyte.

The correct Option is "Sodium reduces ${\rm{C}}{{\rm{O}}_2}$ to carbon."

Mg reacts with cold water and liberate hydrogen gas.

Magnalium is an alloy of Mg and Zn.

Which of the following is correct for the reaction? ${{\rm{N}}_2}\left( {\rm{g}} \right) + 3{{\rm{H}}_2}\left( {\rm{g}} \right)\leftrightharpoons2{\rm{N}}{{\rm{H}}_3}\left( {\rm{g}} \right)$

${{\rm{N}}_2}\left( {\rm{g}} \right) + 3{{\rm{H}}_2}\left( {\rm{g}} \right)\leftrightharpoons2{\rm{N}}{{\rm{H}}_3}\left( {\rm{g}} \right)$ $\Delta n = {n_p} - {n_r}$ $ = 2 - 4$ $ = - 2$ $\therefore {K_p} = {K_c}{\left( {RT} \right)^{ - 2}}$ or ${K_p} = \frac{{{K_c}}}{{{{\left( {RT} \right)}^2}}}$ ${K_p} < {K_c}$

The correct Option is "${K_p} < {K_c}$"

Pressure is required to predict the correlation

For a reaction and equilibrium which of the following is correct?

At chemical equilibrium, rate of forward reaction is equal to the rate of backward reaction.

Concentration of reactant=concentration of product

Concentration of reactant is always greater than product

The correct Option is "Rate of forward reaction=rate of backward reaction"

Which of the following is correct formula of Gammaxane

${C_6}{H_6}C{l_6}$ is called gammaxene.

The correct Option is "${C_6}{H_6}C{l_6}$"

For the combustion reaction at $298\,K$ ${H_2}(g) + \frac{1}{2}{O_2}(g) \to {H_2}O(l)$ which of the following is correct?

$\Delta n = {n_P} - {n_R} = O - \frac{3}{2} = - 1.5$ $\Delta n < O,\Delta H < \Delta U$

The correct Option is "$\Delta H < \Delta E$"

If the lattice constant of this semiconductor is decreased, then which of the following is correct?

If lattice constant of semiconductor is decreased, then ${E_c}\;$ and ${E_v}$ decrease, but ${E_g}$ increases.

All ${E_c},\;\;{E_g},\;\;{E_v}$ increase

${E_c}$ and ${E_v}$ increase, but ${E_g}$ decreases

The correct Option is "${E_c}$ and ${E_v}$ decrease, but ${E_g}$ increases"

All ${E_c},\;\;{E_g},\;\;{E_v}$ decreases

Which of the following is correct?

Zn is placed above Sn in electrochemical series.

Zinc acts as cathode in Daniell cell

In a ${\rm{Li}} - {\rm{Zn}}$ couple, zinc acts as anode

Copper will displace iron in solution

The correct Option is "Zinc displaces tin from its solution"

Which of the following is correct about heavy water?

${{\rm{D}}_2}{\rm{O}}$ had deuterium (heavier isotope of ${\rm{H}}$) and ${\rm{O}}$ (the tighter one ${{{\rm{O}}^{16}}}$).

Water at $4^\circ C$ having maximum density is known as heavy water

It is heavier than water ${\rm{(}}{{\rm{H}}_2}{\rm{O )}}$

The correct Option is "It is formed by the combination of heavier isotope of hydrogen and oxygen"

Which of the following is correct according to adsorption isotherm?

All the option are correct for Freundlich adsorption isotherm at different pressures. $\frac{x}{m} = k{p^1}$ (at low pressure) $\frac{x}{m} = k{p^0}$ (at high pressure) $\frac{x}{m} = k{p^{1/n}}$ (at intermediate pressure)

$\frac{x}{m} \propto {p^{1/n}}$

The correct Option is "All of these"

Which of the following is correct?

Aldehydes are easily oxidised to respective acids.

All aldehydes undergo Cannizzaro’s reaction

Aldehydes are less susceptible to oxidation than ketones

The correct Option is "Aldehydes are more susceptible to oxidation than ketones"

Formaldehyde forms ${\rm{C}}{{\rm{H}}_2}\left( {{\rm{OH}}} \right){\rm{N}}{{\rm{H}}_2}\;with\;{\rm{N}}{{\rm{H}}_3}$

Which of the following is correct?

Calomel is widely used as an antiseptic

The correct Option is "Calomel is used medically as purgative"

Calomel is freely soluble in water

Which of the following is correct for ${\rm{C}}\left( {{\rm{graphite}}} \right) + {{\rm{O}}_2}\left( {{\rm{gas}}} \right) \to {\rm{C}}{{\rm{O}}_2},heat{\rm{ }} = 348\;kJ?$

$\begin{array}{l} C\;graphite + {{\rm{O}}_2}\left( {\rm{g}} \right) \to {\rm{C}}{{\rm{O}}_2};\Delta H = - 348\;kJ\\ 12\;g\;\;\;\;\;\;\;\;\;\;\;\;\;32\;g\;\;\;\;\;\;\;\;44\;g \end{array}$ In the above reaction, heat is evolved and mass of product is equal to mass of reactant.

Mass of product >Mass of reactant

Mass of product < Mass of reactant

The correct Option is "Mass of product = Mass of reactant"

The following figure depicts snapshot of a wave travelling in a medium. Which pair of particles are in phase?

Both points B and G are moving up and are at same distance from equilibrium position at the instant.

The correct Option is "B and G"

A simple pendulum with bob of mass $m$ and conducting wire of length $L$ swings under gravity through an angle ${\rm{2}}\,{\rm{\theta }}$. The earth’s magnetic field component in the direction perpendicular to swing is $B$. Maximum potential difference induced across the pendulum is .

$h = L - L\,\,\cos \,\,{\rm{\theta }}$ $ \Rightarrow \,\,\,h = L\left( {1 - \cos \,\,{\rm{\theta }}} \right)$ ….(i) $\begin{array}{l} \therefore \,\,\,{v^2} = 2{\rm{g}}h - 2{\rm{g}}L\left( {1 - \cos \,\,{\rm{\theta }}} \right)\\ \,\,\,\,\,\,\,\,\,\,\, = 2{\rm{g}}\,L\left( {2\,\,{{\sin }^2}\frac{{\rm{\theta }}}{2}} \right)\\ \Rightarrow \,\,\,v = 2\sqrt {{\rm{g}}L} \,\,\sin \frac{{\rm{\theta }}}{2} \end{array}$ Thus, maximum potential difference $\begin{array}{l} {V_{\max }} = BvL\\ \,\,\,\,\,\,\,\,\,\, = B \times 2\sqrt {{\rm{g}}L} \,\,\sin \frac{{\rm{\theta }}}{2}L\\ \,\,\,\,\,\,\,\,\,\, = 2BL\,\,\sin \frac{{\rm{\theta }}}{2}{\left( {gL} \right)^{1/2}} \end{array}$ .

The correct Option is "$2\,\,BL\,\,\sin \left( {\frac{{\rm{\theta }}}{2}} \right){\left( {{\rm{g}}L} \right)^{1/2}}$"

$BL\,\,\sin \left( {\frac{{\rm{\theta }}}{2}} \right)\left( {{\rm{g}}L} \right)$

$BL\,\,\sin \left( {\frac{{\rm{\theta }}}{2}} \right){\left( {{\rm{g}}L} \right)^{3/2}}$

$BL\,\,\sin \left( {\frac{{\rm{\theta }}}{2}} \right){\left( {{\rm{g}}L} \right)^2}$

The bodies of masses 1 kg and 5 kg are dropped gently from the top of a tower. At a point 20 cm from the ground, both the bodies will have the same

Velocity of fall is independent of the mass of the falling body

The correct Option is "Velocity"

Two electric charges $12\mu C\;{\rm{and}} - 6\mu C$ are placed $20\;cm$ apart in air. There will be a point $P$ on the line joining these charges and outside the region between them, at which the electric potential is zero. The distance of $P$ from $ - 6\mu C$ charge is

Point $P$ will lie near the charge which is smaller in magnitude $i.e. - 6\mu C$ Hence potential at $P$ $V = \frac{1}{{4\pi {\varepsilon _0}}}\frac{{\left( { - 6 \times {{10}^{ - 6}}} \right)}}{x} + \frac{1}{{4\pi {\varepsilon _0}}}\frac{{\left( {12 \times {{10}^{ - 6}}} \right)}}{{\left( {0.2 + x} \right)}} = 0 \Rightarrow x = 0.2\;m$

The correct Option is "$0.20\;m$"

In a phase electromagnetic wave, the electric filed oscillates sinusoidally at a frequency of $2.0 \times {10^{10}}$ Hz and amplitude $48{\rm{\;V}}{{\rm{m}}^{ - 1}}$. The wavelength of the wave is

Wavelength, $\lambda = c/v = 3 \times {10^8}/2 \times {10^{10}} = 1.5 \times {10^{ - 2}}{\rm{\;m}}$

$24 \times {10^{ - 10}}{\rm{\;m}}$

The correct Option is "$1.5 \times {10^{ - 2}}{\rm{\;m}}$"

The moment of the force, $\overrightarrow {\rm{F}} \,{\rm{ = }}\,{\rm{4}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over i} }}\,{\rm{ + }}\,{\rm{5}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over j} }}\,{\rm{ - }}\,{\rm{6}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over k} }}\,$ at $\left( {{\rm{2, }}\,{\rm{0,}}\,{\rm{ - 3}}} \right)$, about the point $\left( {{\rm{2, - }}\,{\rm{2, - 2}}} \right)$, is given by

$\begin{array}{l} \hat F\, = 4\hat i + 5\hat j - 6\hat k\\ r = 2\hat j - \hat k\\ {\rm{Torque}}\, = \,\hat r\, \times \hat F\\ \begin{array}{*{20}{l}} {{\rm{ = }}{\mkern 1mu} {\mkern 1mu} \left| {\begin{array}{*{20}{l}} {\begin{array}{*{20}{c}} {{\rm{\hat i}}}&{{\rm{\hat j}}}&{{\rm{\hat k}}} \end{array}}\\ {\begin{array}{*{20}{c}} {\rm{0}}&{\rm{2}}&{{\rm{ - 1}}} \end{array}}\\ {\begin{array}{*{20}{c}} {\rm{4}}&{\rm{5}}&{{\rm{ - 6}}} \end{array}} \end{array}} \right|}\\ {{\rm{\hat i}}\left( {{\rm{ - 7}}} \right){\rm{ - }}{\mkern 1mu} {\rm{\hat j}}{\mkern 1mu} {\mkern 1mu} \left( {\rm{4}} \right){\rm{ + }}{\mkern 1mu} {\rm{\hat k}}\left( {{\rm{ - 8}}} \right)} \end{array} \end{array}$

The correct Option is "${\rm{ - }}\,{\rm{7}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over i} }}\,{\rm{ - }}\,{\rm{4}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over j} }}\,{\rm{ - }}\,{\rm{8k}}$"

${\rm{ - }}\,{\rm{8\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over i} }}\,{\rm{ - }}\,{\rm{4}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over j} }}\,{\rm{ - }}\,{\rm{7}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over k} }}$

${\rm{ - 7}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over i} }}\,{\rm{ - }}\,{\rm{8}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over j} }}\,{\rm{ - }}\,{\rm{4}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over k} }}$

${\rm{ - }}\,{\rm{4}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over i} }}\,{\rm{ - }}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over j} }}\,{\rm{ - }}\,{\rm{8}}\,{\rm{\mathord{\buildrel{\lower3pt\hbox{$\scriptscriptstyle\frown$}} \over k} }}$

For inelastic collision between two spherical rigid bodies

In an inelastic collision, the particles do not regain their shape and size completely after collision. Some fraction of mechanical energy is retained by the colliding particles in the form of deformation. potential energy .Thus the kinetic energy of particles no longer remains conserved .However, in the absence of external forces, law of conservation of linear momentum still holds good

The total kinetic energy is conserved

The total mechanical energy is not conserved

The liner momentum is not conserved

The correct Option is "The liner momentum is conserved"

A body of mass 0.4 kg is whirled in a vertical circle making 2 rev/sec. If the radius of the circle is 2 m, then tension in the string when the body is at the top of the circle, is

Tension at the top of the circle, $T = m{\omega ^2}r - mg$ , $T = 0.4 \times 4{\pi ^2}{n^2} \times 2 - 0.4 \times 9.8 = 122.2N \approx 115.86N$

The correct Option is "115.86 N"

In the experiment of Ohm’s law, a potential difference of 5.0V is applied across the end of a conductor of length 10.0 cm and diameter of 5.00 mm. The measured current in the conductor is 2.00 A. The maximum permissible percentage error in the resistivity of the conductor is

Given, the potential difference applied across the ends of the conductor, $V = 5V$ The length of the conductor, $L = 10\,cm$ The measured value of the current in the conductor, $l = 2A$ The diameter of the conductor, $d = 5\,mm$ As we know that, $R = \frac{{\rho l}}{A}$ Using ohm’s law, $V = IR{\rm{ }} \Rightarrow {\rm{ }}R = \frac{V}{I}$ $\frac{{\rho l}}{A} = \frac{V}{I}{\rm{ }} \Rightarrow {\rm{ }}\rho = \frac{V}{{Il}}\left( {\frac{{\pi {d^2}}}{4}} \right)$ In error form, $\frac{{\Delta \rho }}{\rho } = \frac{{\Delta V}}{V} + \frac{{\Delta I}}{I} + \frac{{\Delta l}}{l} + 2\frac{{\Delta d}}{d}$ $ \Rightarrow \;\;{\rm{ }}\frac{{\Delta \rho }}{\rho } = \frac{{0.1}}{5} + \frac{{0.01}}{2} + \frac{{0.1}}{{10}} + 2\frac{{(0.001)}}{{(5)}}{\rm{ }} \Rightarrow \frac{{\Delta \rho }}{\rho } = 0.039$ $\frac{{\Delta \rho }}{\rho } \times 100 = 3.9\% $ The maximum permissible percentage error in the resistivity of the conductor is $3.9\% $

NEET Questions

1 .

Medium

Solutions

Subject:

Physics

Chapter:

Communication systems

Subtopic:

Communication systems

Related Questions

NEET Information

NEET TEST PREP

Company