Recent questions tagged 26

The biodegradable polymer is :-

asked Jul 8, 2019 by pady_1

1 answer

The equation of wave is : $y = 1.0 \cos 2 \pi (\frac{t}{0.02} - \frac{x}{10})$ where $t$ is in second. The frequency of the wave is :

asked Dec 19, 2018 by pady_1

0 answers

When heat energy of $1500 \;J$ is suplied to a gas at constant pressure, $2.1 \times 10^5\; N/m^2$, there was an increase in its volume equal to $2.5 \times 10^{-3}m^3$. The increase in its internal energy in joules is :

asked Dec 19, 2018 by pady_1

0 answers

Four bodies $P, \; Q, \; R$ and $S$ are projected with equal velocities having angles of projection $15^{\circ}, \; 30^{\circ}, \; 45^{\circ}$ and $60^{\circ}$ with the horizontal respectively. The body having shortest range is :

asked Dec 19, 2018 by pady_1

0 answers

Photoelectric emission is observed from a metallic surface for frequencies $v_1$ and $v_2$ of the incident light rays $(v_1 > v_2)$. If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of $1 : k$, then the threshold frequency of the metallic surface is :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following is used in optical fibres ?

asked Dec 11, 2018 by pady_1

0 answers

If the electric flux entering and leaving an enclosed surface respectively is $\phi_1$ and $\phi_2$, the electric charge inside the surface will be :

asked Dec 11, 2018 by pady_1

1 answer

On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10 cm. The resistance of their series combination is $1\; K \Omega$. How much was the resistance on the left slot before interchanging the resistances ?

asked Dec 11, 2018 by pady_1

0 answers

A box contains 15 green and 10 yellow balls. If 10 balls are randomly drawn, one-by-one, with replacement, then the variance of the number of green balls drawn is

asked Dec 11, 2018 by pady_1

1 answer

A pipe open at both ends has a fundamental frequency f in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now :

asked Dec 11, 2018 by pady_1

0 answers

A telescope has an objective lens of focal length 150 cm and an eyepiece of focal length 5 cm. If a 50 m tall tower at a distance of 1 km is observed through this telescope in normal setting, the angle formed by the image of the tower is $\theta$, then $\theta$ is close to :

asked Dec 11, 2018 by pady_1

0 answers

A block of mass m is placed on a surface with a vertical cross section given by $y = x^3 /6$. If the coefficient of friction is 0.5, the maximum height above the ground at which the block can be placed without slipping is :

asked Dec 11, 2018 by pady_1

0 answers

Which of the following exists as covalent crystals in the solid state ?

asked Dec 11, 2018 by pady_1

1 answer

Let $X = \{1, 2, 3, 4, 5\}$. The number of different ordered pairs $(Y, Z)$ that can be formed such that $Y \subseteq X, Z \subseteq X$ and $ Y \cap Z$ is empty, is

asked Dec 11, 2018 by pady_1

0 answers

The electrostatic potential inside a charged spherical ball is given by $\phi = \alpha \rho^2 + b$ where r is the distance from the centre, a, b are constants. Then the charge density inside ball is

asked Dec 11, 2018 by pady_1

0 answers

Out of the following, the alkene that exhibits optical isomerism is

asked Dec 11, 2018 by pady_1

0 answers

In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree ($=0.5^{\circ}$), then the least count of the instrument is

asked Nov 29, 2018 by pady_1

0 answers

The statement $p \rightarrow(q \rightarrow p)$ is equivalent to

asked Nov 29, 2018 by pady_1

0 answers

A particle just clears a wall of height b at a distance $a$ and strikes the ground at a distance $c$ from the point of projection. The angle of projection is :

asked Nov 29, 2018 by pady_1

0 answers

The energy spectrum of $\beta$-particles (number N(E) as a function of $\beta$-energy E] emitted from a radioactive source is :

asked Nov 13, 2018 by pady_1

0 answers

If $f$ is a real-valued differentiable function satisfying $|f(x) - f(y)| \leq (x-y)^2, x, y \in R$ and $f(0) = 0$, then $f(1)$ equals :

asked Nov 5, 2018 by pady_1

0 answers

A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work to be done against the gravitational force between them, to take the particle far away from the sphere : (you may take $G=6.67 \times 10^{-11}\; Nm^2/kg^2$)

asked Nov 5, 2018 by pady_1

0 answers

The graph of the function $y = f(x)$ is symmetrical about the line $x=2$, then

asked Nov 5, 2018 by pady_1

0 answers

The kinetic energies of a planet in an elliptical orbit about the Sun, at position A, B and C are $K_A, K_B$ aand $K_C$, respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then

asked Aug 21, 2018 by pady_1

1 answer

Which one is the most acidic compound ?

asked Aug 21, 2018 by pady_1

1 answer

Fog is a colloidal solution of :

asked Aug 21, 2018 by pady_1

1 answer

What is the mole fraction of the solute in a 1.00 m aqueous solution ?

asked Aug 21, 2018 by pady_1

0 answers

Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5 $\Omega$ The power loss in the wire is:

asked Aug 20, 2018 by pady_1

1 answer

The internal resistance of a 2.1 V cell which gives a current of 0.2A through a resistance of $10 \Omega$ is -

asked Aug 20, 2018 by pady_1

1 answer

In the circuit shown the cells A and B have negligible resistance. For $V_A = 12V, R_1 = 500\Omega and R =100 \Omega$ the galvanometer (G) shows no deflection. The value of $V_B$ is

asked Aug 20, 2018 by pady_1

1 answer

The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be :

asked Aug 16, 2018 by pady_1

1 answer

Six vectors, $\overrightarrow{a}$ through $\overrightarrow{f}$ have the magnitudes and directions indicated in the figure. Which of the following statements is true?

asked Jul 26, 2018 by pady_1

1 answer

A wire of resistance 12 ohms per metre is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in the figure, is :

asked Jul 26, 2018 by pady_1

1 answer

Two simple Harmonic Motions of angular frequency 100 and 1000 rad $s^{–1}$ have the same displacement amplitude. The ratio of their maximum accelerations is -

asked Jul 26, 2018 by pady_1

1 answer

Two condensers, one of capacity $C$ and the other of capacity $\frac{C}{2}$ , are connected to a V-volt battery, as shown- The work done in charging fully both the condensers is :

asked Jul 26, 2018 by pady_1

1 answer

When photons of energy hv fall on an aluminium plate (of work function$E_0 $), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be

asked Jul 25, 2018 by pady_1

1 answer

For the network shown in the figure the value of the current i is –

asked Jul 24, 2018 by pady_1

1 answer

If $\lambda_{m}$ denotes the wavelength at which the radioactive emission from a black body at a temperature T K is maximum, then :-

asked Jul 24, 2018 by pady_1

1 answer

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is -

asked Jul 24, 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

Which one among shows particle nature of light.

asked Jul 20, 2018 by pady_1

1 answer

Two stationary sources each emitting waves of wave length $\lambda$. An observer moves from one source to other with velocity u. Then number of beats heared by him :

asked Jul 20, 2018 by pady_1

1 answer

For a Rocket propulsion velocity of exhaust gases relative to rocket is 2 km/s. If mass of rocket system is 1000 kg, then the rate of fuel consumption for a rocket to rise up with acceleration $4.9 m/s^{2}$ will be :

asked Jun 15, 2018 by pady_1

1 answer

The total of the ages of Amar, Akbar and Anthony is 80 years. What was the total of their ages three years ago ?

asked Dec 31, 2015 by pady_1

0 answers

The following bar chart shows the number of fruits in a shop, , There are _______ less guavas than plums.

asked Dec 31, 2015 by pady_1

0 answers

Find the cost of painting square board of side 44 cm at the rate of $ 7 per sq. cm.

asked Dec 31, 2015 by pady_1

0 answers

$\large\frac{1245}{1000}$ in decimal form gives us

asked Dec 31, 2015 by pady_1

0 answers

The air fare from Delhi to Hyderabad is $ 1500 plus a 10\% surcharge. Find the total air fare of a round trip.

asked Dec 31, 2015 by pady_1

0 answers

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