Recent questions tagged 2004

Which of the following does not have a metal- carbon bond :-

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Lanthanides are :-

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Which of the following forms cationic micelles above certain concentration :-

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A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness e and resistance of 100 ohm. The difference of potential between two points on the wire separated by a distance of 50 cm will be :-

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The Bohr model of atoms :-

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In a p–n junction photo cell, the value of the photo electromotive force produced by monochromatic light is proportional to: -

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The coefficient of static friction, µs, between block A of mass 2 kg and the table as shown in the figure is 0.2. What would be the maximum mass value of block B so that the two blocks do not move ? The string and the pulley are assumed to be smooth and massless. ($g = 10 m/s^{2}$)

asked Jul 24, 2018 by pady_1

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If $\mid \overrightarrow{A}\times \overrightarrow{B}\mid=\sqrt{3} \overrightarrow{A}.\overrightarrow{B}$ then the value of $\mid \overrightarrow{A}+ \overrightarrow{B}\mid$ is:

asked Jul 24, 2018 by pady_1

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The phase difference between two waves, <br> $y_{1}=10^{-6} \sin \{100t+(x/50)+0.5\}m$ <br> $y_2=10^{-6} \cos \{100t+(\frac{ x} {50})\}m$ <br> Where X is expressed in metres and t is expressed in seconds, is approximately : -

asked Jul 24, 2018 by pady_1

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A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometer from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å, is of the order of-

asked Jul 24, 2018 by pady_1

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$M_P$ denotes the mass of a proton and $M_n$that of a neutron. A given nucleus, of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by (c is velocity of light )

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The half life of radium in about 1600 years. Of 100g of radium existing now, 25g will remain undecayed after :-

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A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in t the ratio of-

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A round disc of moment of inertia $I_2$ about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia $I_1$ rotating with an angular velocity $\omega$ about the same axis. The final angular velocity of the combination of discs is :-

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A nucleus represented by the symbol $_{Z}^{A}X$ has :-

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According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is :-

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If in a nuclear fusion process the masses of the fusing nuclei be $m_1$ and $m_2$ and the mass of the resultant nucleus be$ m_3$, then

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A mass of 0.5 kg moving with a speed of 1.5 m/s on a horizontal smooth surface, collides with a nearly weightless spring of force constant k = 50 N/m. The maximum compression of the spring would be :- <br>

asked Jul 24, 2018 by pady_1

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The peak voltage in the output of a half wave diode rectifier fed with a sinusoidal signal without filter is 10V. The d. c. component of the output voltage is :-

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In semiconductors at a room temperature

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The density of newly discovered planet is twice that of earth. The acceleration due to gravity at the surface of the planet is equal to that at the surface of the earth. If the radius of the earth is R, the radius of the planet would be :-

asked Jul 24, 2018 by pady_1

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A car is moving towards a high cliff. The car driver sounds a horn of frequency 'f'. The reflected sound heard by the driver has a frequency 2f. If 'v' be the velocity of sound then the velocity of the car, in the same velocity units, will be -

asked Jul 24, 2018 by pady_1

2 answers

Of the diodes shown in the following diagrams, which one of the diode is reverse biased ? +5V R

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Two springs of spring constants $k_1$ and$ k_2$ are joined in series. The effective spring constant of the combination is given by -

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Which one of the following statements is true for the speed 'v' and the acceleration 'a' of a particle executing simple harmonic motion

asked Jul 24, 2018 by pady_1

2 answers

The telomeres of eukaryotic chromosomes consist of short sequences of -

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In which one of the following habitats does the diurnal temperature of soil surface vary most ?

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Which one of the following is living fossil -

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In oogamy fertilization involves -

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Presence of gills in the tadpole of frog indicates that :-

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In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order :-

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One of the following is a very unique feature of the mammalian body -

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Which one of the following pairs is not correctly matched ?

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When$ CO_2$ concentration in blood increases, breathing becomes -

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According to oparin, which one of the following was not present in the primitive atmosphere of the earth :-

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After a mutation at a genetic locus the character of an organism changes due to the change in :-

asked Jul 24, 2018 by pady_1

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In a plant red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt

asked Jul 24, 2018 by pady_1

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During replication of a bacterial chromosomes DNA synthesis starts from a replication origin site and :-

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Which one of the following is not correctly matched

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Cancer cells are more easily damaged by radiation than normal cells because they are -

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Duodenum has characteristic Brunner's glands which secrete two hormones called -

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Certain characteristic demographic features of developing countries are -

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ATPase enzyme needed for muscle contraction is located in -

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Uricotelism is found in -

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In 1984, the Bhopal gas tragedy took place because methyl isocyanate :-

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If by radiation all nitrogenase enzyme are inactivated, then there will be no :-

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In your opinion, which is the most effective way to conserve the plant diversity of an area :-

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Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to :-

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Which of the following is expected to have the highest value $(gm/m^ 2/yr)$ in a grassland ecosystem : -

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Lichens are well known combination of an alga and a fungus where fungus has :-

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