Recent questions tagged 32

Which one is malachite from the following ?

asked Jul 8, 2019 by pady_1

1 answer

Fraunhofer lines are due to :

asked Dec 19, 2018 by pady_1

0 answers

The final image in an astronomical telescope is :

asked Dec 19, 2018 by pady_1

0 answers

The radius of gyration of a sphere of mass $M$ and radius $R$ about the axis parallel to the axis passing through its centre and tangent to the sphere is :

asked Dec 19, 2018 by pady_1

0 answers

In an experiment of simple pendulum, the errors in the measurement of length of the pendulum (L) and time period (T) are 3% and 2% respectively. The maximum percentage error in the value of $\frac{L}{T^2}$ is :

asked Dec 11, 2018 by pady_1

0 answers

If $N_0$ is the original mass of the substance of half-life period $t_{1/2} = 5\; years$, then the amount of substance left after 15 years is

asked Dec 11, 2018 by pady_1

0 answers

A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is :

asked Dec 11, 2018 by pady_1

0 answers

If $L_1$ is the line of intersection of the planes $2x- 2y+ 3z - 2 =0,\; x- y + z+1=0$ and $L_2$ is the line of intersection of the planes $x+2y -z-3=0, \; 3x - y + 2z - 1=0$, then the distance of the origin from the plane, containing the lines $L_1$ and $L_2$, is :

asked Dec 11, 2018 by pady_1

1 answer

The following observations were taken for determining surface tension T of water by capillary method : diameter of capillary, $D = 1.25 \times 10^{–2}$ m rise of water , $h = 1.45 \times 10^{–2} m$. Using $ g = 9.80\; m/s^2$ and the simplified relation $T = \frac{rhg}{2} \times 10^3\; N/m$, the possible error in surface tension is closest to :

asked Dec 11, 2018 by pady_1

0 answers

Two closed bulbs of equal volume $(V)$ containing an ideal gas initially at pressure pi and temperature $T_1$ are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to $T_2$ . The final pressure $p_f$ is : <br>

asked Dec 11, 2018 by pady_1

0 answers

Which of the following is not an assumption of the kinetic theory of gases ?

asked Dec 11, 2018 by pady_1

1 answer

If the coefficients of $x^3$ and $x^4$ in the expansion of $(1 + ax + bx^2 ) (1 - 2x)^{18}$ in powers of $x$ are both zero, then $(a, b)$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

ABCD is a trapezium such that AB and CD are parallel and $BC \perp CD$. If $\angle{ADB} = \theta, \; BC = p$ and $CD = q$, then AB is equal to

asked Dec 11, 2018 by pady_1

1 answer

The figure shows an experimental plot for discharging of a capacitor in an R-C circuit. The time constant $\tau$ of this circuit lies between : <br>

asked Dec 11, 2018 by pady_1

0 answers

If $A = \sin^2 x + \cos^2 x $, then for all real $x$

asked Dec 11, 2018 by pady_1

0 answers

Let C be the capacitance of a capacitor discharging through a resistor R. Suppose $t_1$ is the time taken for the energy stored in the capacitor to reduce to half its initial value and $t_2$ is the time taken for the charge to reduce to one-fourth its initial value. Then the ratio $t_1/t_2$ will be

asked Dec 11, 2018 by pady_1

0 answers

A liquid was mixed with ethanol and a drop of concentrated $H_2SO_4$ was added. A compound with a fruity smell was formed. The liquid was :

asked Nov 29, 2018 by pady_1

0 answers

27. How many different words can be formed by jumbling the letters in the word MISSISSIPPI in which no two S are adjacent?

asked Nov 29, 2018 by pady_1

0 answers

Let P = (-1, 0), Q = (0, 0) and R = (3, 3$\sqrt{3}$) be three points. The equation of the bisector of the angle PQR is :

asked Nov 29, 2018 by pady_1

0 answers

The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let $D_1$ and $D_2$ be angles of minimum deviation for red and blue light respectively in a prism of this glass, then :

asked Nov 13, 2018 by pady_1

0 answers

The normal to the curve $x = a (\cos \theta + \theta \sin \theta), y = a (\sin \theta - \theta \cos \theta)$ at any point $'\theta'$ is such that :

asked Nov 5, 2018 by pady_1

0 answers

If radius of the $^{27}_{13} Al$ nucleus is estimated to be 3.6 fermi, then the radius of $^{125}_{52} Te$ nucleus be nearly :

asked Nov 5, 2018 by pady_1

0 answers

A function $y = f(x)$ has a second order derivative $f"(x) = 6 (x=1)$. If its graph passes through the point $(2, 1)$ and at that point the tangent to the graph is $y = 3x -5$, then the function is

asked Nov 5, 2018 by pady_1

0 answers

The moment of the force, $\overrightarrow{F} = 4 \hat{i} + 5 \hat{j} - 6 \hat{k}$ at (2, 0, -3) about the point (2, -2, -2), is given by

asked Aug 21, 2018 by pady_1

1 answer

In the electrochemical cell - <br> $Zn|ZnSO_4 \; (0.01 M) || CuSO_4 \; (1.0 M) | Cu$, the emf of this Daniel cell is $E_1$. When the concentration of $ZnSO_4$ is changed to $0.1 M$ and that of $CuSO_4$ changed to $0.01 M$, the emf changes to $E_2$. From the followings, which one is the relayionship between $E_1$ and $E_2$ ? (Given , $\frac{RT}{F} = 0.059$)

asked Aug 21, 2018 by pady_1

1 answer

Among the following the correct order of acidity is :

asked Aug 21, 2018 by pady_1

1 answer

Reaction of a carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is -

asked Aug 21, 2018 by pady_1

1 answer

A thin semicircular conducting the ring (PQR) of radius 'r' is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. Teh potential difference developed across the ring when its speed is v, is:<br>

asked Aug 20, 2018 by pady_1

1 answer

A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when -

asked Aug 20, 2018 by pady_1

1 answer

A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere rage. The value (in ohm) of necessary shunt will be

asked Aug 20, 2018 by pady_1

1 answer

Two waves are represented by the equations $y_1 = a \sin (wt + kx + 0.57) m$ and $ y_2 = a \cos (wt + kx) m, where \;$x$\; is\; in\; meter\; and\; $t in sec. The phase difference between them is :

asked Aug 16, 2018 by pady_1

1 answer

In producing chlorine by electrolysis 100 kW power at 125 V is being consumed. How much chlorine per minute is liberated (E.C.E. of chlorine is $0.367 \times10^{–6}$ kg/C) –

asked Jul 26, 2018 by pady_1

1 answer

A galvanometer having a coil resistance of $60\Omega$ shows full scale deflection when a current of 1. amp passes through it. It can be converted into an ammeter to read currents upto 5.0 amp by :

asked Jul 26, 2018 by pady_1

1 answer

A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively -

asked Jul 26, 2018 by pady_1

1 answer

Under the influence of a uniform magnetic field a charged particle is moving in a circle of radius R with constant speed v. The time period of the motion-

asked Jul 26, 2018 by pady_1

1 answer

The radius of Germanium (Ge) nuclide is measured to be twice the radius of $_{4}^{9}Be$ . The number of nucleons in Ge are:-

asked Jul 25, 2018 by pady_1

2 answers

A network of four capacitors of capacity equal to $C_1=C,C_2=2C,C_3=3C,C_4=4C$ are conducted to a battery as shown in the figure. The ratio of the charges on $C_2$ and $C_4$ is

asked Jul 24, 2018 by pady_1

1 answer

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

1 answer

Three capacitors each of capacity $4 \mu F$ are to be connected in such a way that the effective capacitance of $6 \mu F$. This can be done by -

asked Jul 24, 2018 by pady_1

1 answer

A wave travelling in positive X-direction with A = 0.2 m velocity = 360 m/s and $\lambda$ = 60 m, then correct expression for the wave is : -

asked Jul 23, 2018 by pady_1

1 answer

A capacitor of capacity C and reactance X if capacitance and frequency become double then reactance will be :-

asked Jul 20, 2018 by pady_1

1 answer

Given Truth table is correct for :

asked Jul 20, 2018 by pady_1

1 answer

Two long parallel wires are at a distance of 1m. If both of them carry one ampere of current in same direction, then the force of attraction on unit length of the wires will be :

asked Jun 15, 2018 by pady_1

1 answer

The hardware store sells orange buckets, which hold 10 litres of water, and teal buckets, which hold 7 litres. Johnny bought 5 buckets. His buckets will hold 44 litres in total. How many of each type of bucket did Johnny buy?

asked Dec 31, 2015 by pady_1

1 answer

The number of lines of symmetry in a circle is

asked Dec 31, 2015 by pady_1

1 answer

Tom`s weight is 45000g.What is his weight in kg?

asked Dec 31, 2015 by pady_1

0 answers

$5 \large\frac{1}{8} \div 8 \large\frac{2}{16}$

asked Dec 31, 2015 by pady_1

0 answers

If 189 cans contain 516.726 liters of milk. What is the volume that can be contained in 88 cans of milk?

asked Dec 31, 2015 by pady_1

0 answers

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