Recent questions tagged 2003

The physical quantities not having same dimensions are :

asked Dec 11, 2018 by pady_1

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An ammeter reads upto $1A$. Its internal resistance is $0.81 \Omega$. To increase the range to $10 \;A$, the value of the required shunt is:

asked Dec 11, 2018 by pady_1

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A boy playing on the roof of a 10 m high building throws a ball with a speed of 10 m/s at an angle of $30^{\circ}$ with the horizontal. How far from the throwing point will the ball be at the height of $10 \;m$ from the ground ? [$g = 10\; m/s^2, \; \sin 30^{\circ} = 1/2,\; \cos 30^{\circ} = \sqrt{3}/2]$

asked Dec 11, 2018 by pady_1

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A car moving with a speed of $50\; km/h$, can be stopped by brakes after at least $6 \;m$. If the same car is moving at a speed of $100\; km/h$, the minimum stopping distance is :

asked Dec 11, 2018 by pady_1

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

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Two spherical bodies of mass M and 5M and radii R and 2R respecitvely are released in free space with initial separation between their centres equal to 12 R. If they attract each other due to gravitational force only, then the distance covered by the smaller body just before collision is :

asked Dec 11, 2018 by pady_1

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When $U^{238}$ nucleus originally at rest, decays by emitting an alpha particle having a speed $u$, the recoil speed of the residual nucleus is :

asked Dec 11, 2018 by pady_1

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Which of the following radiations has the least wavelength ?

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A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is :

asked Dec 11, 2018 by pady_1

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The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become :

asked Dec 11, 2018 by pady_1

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A circular disc $X$ of radius $R$ is made from an iron plate of thickess $t$, and another disc $Y$ of radius $4R$ is made from an iron plate of thickness $t/4$. Then the relation between the moment of inertia $I_X$ and $I_Y$ is :

asked Dec 11, 2018 by pady_1

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Dimensions of $\frac{1}{\mu_0 \varepsilon_0}$, where symbols have their usual meaning, are :

asked Dec 11, 2018 by pady_1

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The negative $Zn$ pole of Daniell cell, sending a constant current through a circuit, decreases in mass by $0.13\;g$ in $30$ minutes. If the electrochemical equivalent of $Zn$ and $Cu$ are $32.5$ and $31.5$ respectively, the increase in the mass of the positive $Cu$ pole in this time is :

asked Dec 11, 2018 by pady_1

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The thermo-emf of a thermocouple is $25 \; \mu V/^{\circ}C$ at room temperature. A galvanometer of $40 \Omega$ resistance, capable of detecting current as low as $10^{-5}A$, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is :

asked Dec 11, 2018 by pady_1

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Consider telecommunication through optical fibres. Which of the following statements is not true ?

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A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of :

asked Dec 11, 2018 by pady_1

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The length of a wire of a potentiometer is 100 cm, and the emf of its stand and cell is E volt. It is employed to measure the emf of a battery whose internal resistance is $0.5 \Omega$. If the balance point is obtained at $l = 30\; cm$ from the positive end, the emf of the battery is :

asked Dec 11, 2018 by pady_1

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A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s, the reading of the spring balance will be :

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Curie temperature is the temperature above which :

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The magnetic lines of force inside a bar magnet :

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A magnetic needle lying parallel to a magnetic field requires $W$ unit of work to turn it through $60^{\circ}$. The torque needed to maintain the needle in this position will be :

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A thin rectangular magnet suspended freely has a period of oscillation equal to $T$. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is $T'$, the ratio $T'/T$ is :

asked Dec 11, 2018 by pady_1

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A particle of charge $-16 \times 10^{-18} C$ moving with velocity $10\; ms^{-1}$ along the x-axis enters a region where a magnetic field of induction B is along the y-axis and an electric field of magnitude $10^4 V/m$ is along the negative z-axis. If the charged particle continues moving along the x-axis, the magnitude of B is :

asked Dec 11, 2018 by pady_1

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A particle of mass $M$ and charge $Q$ moving with velocity $\overrightarrow{v}$ describes a circular path of radius $R$ when subjected to a uniform transverse magnetic field of induction $B$. The work done by the field when the particle completes one full circle is :

asked Dec 11, 2018 by pady_1

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The term "antibiotic" was coined by : -

asked Jul 24, 2018 by pady_1

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The aleurone layer in maize grain is specially rich in :-

asked Jul 24, 2018 by pady_1

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Genetic Map is one that : -

asked Jul 24, 2018 by pady_1

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Gray spots of oat are caused by deficiency of : -

asked Jul 24, 2018 by pady_1

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Coconut milk factor is : -

asked Jul 24, 2018 by pady_1

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Which one of the following triplet codes, is correctly matched with its specificity for an amino acid in protein synthesis or as 'start' or 'stop' codon : -

asked Jul 24, 2018 by pady_1

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Species are considered as :-

asked Jul 24, 2018 by pady_1

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Which one of the following pairs of plants are not seed producers : -

asked Jul 24, 2018 by pady_1

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Which one of the following statements about viruses is correct : -

asked Jul 24, 2018 by pady_1

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Sexual reproduction in Spirogyra is an advanced feature because it shows : -

asked Jul 24, 2018 by pady_1

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Phenetic classification is based on : -

asked Jul 24, 2018 by pady_1

1 answer

In alcohol fermentation : -

asked Jul 24, 2018 by pady_1

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Mycorrhiza is an example of :-

asked Jul 24, 2018 by pady_1

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Tobacco mosaic virus is a tubular filament of size : -

asked Jul 24, 2018 by pady_1

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ELISA is used to detect viruses where the key reagent is : -

asked Jul 24, 2018 by pady_1

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Which one of the following is categorised under living fossils : -

asked Jul 24, 2018 by pady_1

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Boron in green plants assists in : -

asked Jul 24, 2018 by pady_1

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Chlorenchyma found in : -

asked Jul 24, 2018 by pady_1

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Bartholin's glands are situated : -

asked Jul 24, 2018 by pady_1

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The chief advantage of encystment to an Amoeba is : -

asked Jul 24, 2018 by pady_1

1 answer

Plants reproducing by spores such as mosses and ferns are grouped under the general term : -

asked Jul 24, 2018 by pady_1

2 answers

Which one pair of examples will correctly represent the grouping Spermatophyta according to one of the schemes of classifying plants : -

asked Jul 24, 2018 by pady_1

1 answer

Which of the following plants are used as green manure in crop fields and in sandy soils : -

asked Jul 24, 2018 by pady_1

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In which kingdom would you classify the archaea and nitrogen-fixing organism, if the five-kingdom system of classification is used :

asked Jul 24, 2018 by pady_1

2 answers

Nicotiana sylvestris flowers only during long days and N. tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offspring. What is the best reason for considering N. sylvestris and N. tabacum to be separate species : -

asked Jul 24, 2018 by pady_1

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Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants :-

asked Jul 24, 2018 by pady_1

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