Recent questions in 1999

MgO and NaCl has similar structure. In MgO magnesiuem is surrounded by how many oxygen atoms :

asked Jun 21, 2018 by pady_1

1 answer

What is false for mole fraction :

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2 answers

$H_2 O_2$ on oxidation gives :

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1 answer

A compound $BA_2$ has $K_{sp}=4\times 10^{-12}$ solubility of this comp. will be :

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$FeCr_2 O_7$ reacts with $Na_2CO_3$ gives the product :

asked Jun 21, 2018 by pady_1

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Compound 'A' in acidic medium does not give ppt with $H_2S$ but in $NH_4OH$ medium gives a ppt comp. 'A' is :

asked Jun 21, 2018 by pady_1

1 answer

In a gaseous mixture which of $NO_2$ , $CO_2$ and $N_2 O$ gases have same rate of diffusion :

asked Jun 21, 2018 by pady_1

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$a Zn+b NO_{3}^{-}+cH\to d NH_{4}^{+}+e H_2O+f Zn^{+2}$ a, b, c, d, e and f are :

asked Jun 21, 2018 by pady_1

1 answer

In which of the following compound H atom is directly linked with phosphorus :

asked Jun 21, 2018 by pady_1

1 answer

Which of the following example behave as a lewis acid $BF_3$ , $SnCl_2$ , $SnCl_4$ :

asked Jun 21, 2018 by pady_1

1 answer

Oxidation Number of P in pyrophosphoric acid is :

asked Jun 21, 2018 by pady_1

1 answer

Which of the following does not reduce Fehling solution :

asked Jun 21, 2018 by pady_1

2 answers

Which of the following compound is coloured and has unpaired electron :

asked Jun 21, 2018 by pady_1

1 answer

Order of acidic strength of the following compound will be :

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1 answer

Cynohydrin of the following compound on hydrolysis gives optically active product :

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1 answer

Acetaldehyde reacts with semicarbazide product will be :

asked Jun 21, 2018 by pady_1

2 answers

Which of the following gives ethyl benzene with phenyl methyl ketone :

asked Jun 21, 2018 by pady_1

2 answers

Structure of trans 2-hexanal is :

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1 answer

Half life of a radioactive sample is 4 days. After 16 days how much quantity of matter remain undecayed :

asked Jun 21, 2018 by pady_1

1 answer

The concentration of a solution is changed from 0.2 to 0.4, then what will be rate and rate constant. The reaction is of first order and rate constant is K = $1\times 10^{–6}$ :

asked Jun 21, 2018 by pady_1

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Which of the following electronic configuration will have maximum I.P. difference between II and III I.P. :

asked Jun 21, 2018 by pady_1

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Ionization energy of second orbit of $Li^{+2}$ will be :

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1 answer

Mole ratio of $H_2$ and $O_2$ gas is 8 : 1 what will be the ratio of wt. :

asked Jun 21, 2018 by pady_1

1 answer

For a body angular velocity $\overrightarrow{\omega}=\widehat{i}-2\widehat{j}+3\widehat{k}$ and radius vector is $\overrightarrow{r}=\widehat{i}+\widehat{j}+\widehat{k}$ then its velocity is :

asked Jun 21, 2018 by pady_1

1 answer

When a spring is subjected to 4N force its length is a metre and if 5N is applied length is b metre. If 9N is applied its length is :

asked Jun 21, 2018 by pady_1

1 answer

For moon, its mass is 1/81 of earth mass and its diameter is 1/3.7 of earth dia.If acceleration due to gravity at earth surface is $9.8 m/s ^{2}$ then at moon its value is :

asked Jun 21, 2018 by pady_1

1 answer

Rohini satellite is at a height of 500 km. and Insat-B is at a height of 3600 km. from surface of earth then relation between their orbital velocity ( $V_R$ , $V_1$ ) is :

asked Jun 21, 2018 by pady_1

2 answers

If radius of earth shrinks by 1% then for acceleration due to gravity :

asked Jun 21, 2018 by pady_1

1 answer

A particle starts from rest with constant acceleration. The ratio of space-average velocity to the time average velocity is :

asked Jun 21, 2018 by pady_1

1 answer

A light of amplitude A and wavelength ? is incident on a metallic surface, then saturation current flows is proportional to (assume cut off wave length = ${\lambda_{0}}$ ) -

asked Jun 21, 2018 by pady_1

0 answers

The current conduction in a discharge tube is due to -

asked Jun 21, 2018 by pady_1

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The energy and capacity of a charged parallel plate capacitor are E and C respectively. Now a dielective slab of $\epsilon_r=6$ is inserted in it then energy and capacity becomes (Assuming charge on plates remains constant)

asked Jun 21, 2018 by pady_1

1 answer

Frequency of simple pendulum in a free falling lift is -

asked Jun 21, 2018 by pady_1

1 answer

A spring elongated by length 'L' when a mass 'M' is suspended to it. Now a tiny mass 'm' is attached and then released, its time period of oscillation is -

asked Jun 21, 2018 by pady_1

1 answer

Two springs A and B $(K_A = 2 K_B)$ are stretched by same suspended weights then ratio of workdone in stretching is -

asked Jun 21, 2018 by pady_1

1 answer

The amplitude of a S.H.O. reduces to 1/3 in first 20 secs. then in first 40 sec. its amplitude becomes -

asked Jun 21, 2018 by pady_1

1 answer

The truth table for the following network is :

asked Jun 21, 2018 by pady_1

1 answer

For a vibration magnetometer, the time period of suspended bar magnet can be reduced by -

asked Jun 21, 2018 by pady_1

1 answer

In millikan oil drop experiment a charged drop falls with a terminal velocity V. If an electric field E is applied vertically upwards it moves with terminal velocity 2V in upward direction. If electric field reduces to E/2 then its terminal velocity will be -

asked Jun 21, 2018 by pady_1

2 answers

The terminal potential difference of a cell is greater than its emf when -

asked Jun 21, 2018 by pady_1

1 answer

For a inductor coil L = 0.04 H, then workdone by source to establish a current of 5A in it is -

asked Jun 21, 2018 by pady_1

2 answers

Eight equals charged tiny drops are combined to form a big drop. If the potential on each drop is 10V then potential of big drop will be -

asked Jun 21, 2018 by pady_1

1 answer

A current carrying coil (I = 5A, R = 10 cm.) having 50 number of turns find field at its centre-

asked Jun 21, 2018 by pady_1

1 answer

If 100N force is applied to 10 kg. block as shown in diagram then acceleration produced for slab - $100 N \mu S = 0.6 10 kg. \mu K = 0.4 40 kg.$ Slab

asked Jun 21, 2018 by pady_1

2 answers

For a particle displacement time relation is $t=\sqrt{x}+3$ . Its displacement when its velocity is zero -

asked Jun 21, 2018 by pady_1

1 answer

Two particles separated at a horizontal distance X as shown in fig. they projected at the same line as shown in fig. with different initial speeds. The time after which the horizontal distance between them become zero

asked Jun 21, 2018 by pady_1

1 answer

The K.E. of a person is just half of K.E. of a boy whose mass is just half of tha person. If person increases its speed by 1 m/s, then its K.E. equals to that of boy then initial speed of person was -

asked Jun 21, 2018 by pady_1

1 answer

A body starts falling from height 'h' and travels distance h/2 during last second of motion then time of flight is (In second) -

asked Jun 21, 2018 by pady_1

1 answer

The error in measurement of radius of a sphere is 0.1% then error in its volume is -

asked Jun 21, 2018 by pady_1

1 answer

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