Recent questions tagged past papers

In $NO_3^-$ ion number of bond pair and lone pair of electrons on nitrogen atom are : -

asked Jul 23, 2018 by pady_1

1 answer

A solution containing components A and B follows Raoult's law : -

asked Jul 23, 2018 by pady_1

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A solution contains non volatile solute of molecular mass $M_2$ . Which of the following can be used to calculate the molecular mass of solute in terms of osmotic pressure : - Note :$m_2$ → mass of solute V → Volume of solution p → Osmotic pressure

asked Jul 23, 2018 by pady_1

2 answers

Which has maximum molecules : -

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$2A \rightarrow B+C$ It would be a zero order reaction when : -

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$3A\rightarrow 2B$, rate of reaction $\frac{+d[B]}{dt}$ is equals to : -

asked Jul 23, 2018 by pady_1

1 answer

Heat of combustion $\bigtriangleup H^o$ for C(s), $H_2(g)$ and $CH_4 (g)$ are – 94, – 68 and – 213 Kcal/mol. then $\bigtriangleup H^o for C(s)+2H_2(g)\rightarrow CH_4(g)$ is : -

asked Jul 23, 2018 by pady_1

1 answer

In Hydrogen atom, energy of first excited state is – 3.4 eV. Then find out KE of same orbit of Hydrogen atom : -

asked Jul 23, 2018 by pady_1

1 answer

$_{92}U^{235}$, nucleus absorb a neutron and disintegrate in $_{54}Xe^{139}$, $_{38}Sr^{94}$ and x So, What will be the product x : -

asked Jul 23, 2018 by pady_1

1 answer

A deuteron is bombarded on $_{8}O^{16}$ nucleus then $\alpha$-particle is emitted then product nucleus is -

asked Jul 23, 2018 by pady_1

2 answers

A sample of radioactive element containing $4 \times10^{16}$ active nuclei. Half life of element is 10 days, then number of decayed nuclei after 30 days : -

asked Jul 23, 2018 by pady_1

2 answers

The velocity of electromagnetic wave is parallel to : -

asked Jul 23, 2018 by pady_1

1 answer

Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similer poles are same side then its time period of osccilation is $T_1$ . Now the polarity of one of the magnet is reversed then time period of osccilation is $T_2$ , then : -

asked Jul 23, 2018 by pady_1

0 answers

A charge 'q' moves in a region where electric field and magnetic field both exist, then force on it is : -

asked Jul 23, 2018 by pady_1

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The magnetic field of given length of wire for single turn coil at its centre is 'B' then its value for two turns coil for the same wire is : -

asked Jul 23, 2018 by pady_1

1 answer

For a series LCR circuit the power loss at resonance is : -

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2 answers

Specific resistance of a conductor increases with :

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1 answer

For the given circuit of P-N junction diode which is correct : ->

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1 answer

The given truth table is for which logic gate : -

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1 answer

In a PN junction : -

asked Jul 23, 2018 by pady_1

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A whistle revolves in a circle with angular speed $\omega$ = 20 rad/sec using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer which is far away from the centre : - ($V_{sound }= 340 m/s$)

asked Jul 23, 2018 by pady_1

1 answer

A block of mass 10 kg placed on rough horizontal surface having coefficient of friction µ = 0.5, if a horizontal force of 100 N acting on it nd then acceleration of the block will be : - ss

asked Jul 23, 2018 by pady_1

2 answers

A point P consider at contact point of a wheel on ground which rolls on ground without sliping then value of displacement of point P when wheel completes half of rotation (If radius of wheel is 1m) : -

asked Jul 23, 2018 by pady_1

1 answer

A body of mass m is placed on earth surface which is taken from earth surface to a height of h = 3R then change in gravitational potential energy is : -

asked Jul 23, 2018 by pady_1

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An object of mass 3kg is at rest. Now a force of F = 6t 2 i + 4t j is applied on the object then velocity of object at t = 3 second is : -

asked Jul 23, 2018 by pady_1

1 answer

Number of atom per unit cell in B.C.C. : -

asked Jul 23, 2018 by pady_1

1 answer

Unit of Stefan's constant is : -

asked Jul 23, 2018 by pady_1

1 answer

The efficiency of carnot engine is 50% and temperature of sink is 500K. If temperature of source is kept constant and its efficiency raised to 60%, then the required temperature of the sink will be : -

asked Jul 23, 2018 by pady_1

1 answer

A solid sphere of radius R is placed on smooth horizontal surface. A horizontal force 'F' is applied at height 'h' from the lowest point. For the maximum, acceleration of centre of mass, which is correct : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following is not the property of cathode rays : -

asked Jul 23, 2018 by pady_1

1 answer

What is the cause of “Green house effect” : -

asked Jul 23, 2018 by pady_1

1 answer

When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occurs by incidence of : -

asked Jul 23, 2018 by pady_1

1 answer

If particles are moving with same velocity, then De-Broglie wavelength is maximum for : -

asked Jul 23, 2018 by pady_1

1 answer

Which is having minimum wavelength : -

asked Jul 23, 2018 by pady_1

1 answer

A disc is rotating with angular speed $\omega$. If a child sits on it, what is conserved : -

asked Jul 23, 2018 by pady_1

1 answer

Displacement between max. P.E. position and max. K.E. position for a particle excuting simple harmonic motion is : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following reunites the exon segments after RNA splicing : -

asked Jul 23, 2018 by pady_1

1 answer

There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on chromosome

asked Jul 23, 2018 by pady_1

1 answer

Manipulation of DNA in genetic engineering became possible due to the discovery of : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following crops have been brought to India from New world : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following enzymes are used to join bits of DNA : -

asked Jul 23, 2018 by pady_1

1 answer

Which of the following statement is true : -

asked Jul 23, 2018 by pady_1

1 answer

Exon part of m-RNAs have code for : -

asked Jul 23, 2018 by pady_1

1 answer

Lipids are insoluble in water because lipids molecules are : -

asked Jul 23, 2018 by pady_1

0 answers

Axillary bud and terminal bud derived from the activity of : -

asked Jul 23, 2018 by pady_1

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A gene said to be dominant if : -

asked Jul 23, 2018 by pady_1

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Which of the following is the example of pleiotropic gene ; -

asked Jul 23, 2018 by pady_1

1 answer

Four radial V.B. are found in : -

asked Jul 23, 2018 by pady_1

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In E. Coli, during lactose metabolism repressor binds to : -

asked Jul 23, 2018 by pady_1

1 answer

Vessels are found in : -

asked Jul 23, 2018 by pady_1

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