Recent questions tagged 50

A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be :$(g = 10\frac{m}{s^2})$

asked Jul 8, 2019 by pady_1

1 answer

The potential in the depletion layer is due to :

asked Dec 19, 2018 by pady_1

0 answers

A varying current in a coil changes from 10 A to zero in 0.5 s. If the average emf induced in the coil is 2 volts, the self inductance of the coil is :

asked Dec 19, 2018 by pady_1

0 answers

The focal length of the lenses of an astronomical telescope are 50 cm and 5 cm. The length of the telescope when the image is formed at the least distance of distinct vision is :

asked Dec 19, 2018 by pady_1

0 answers

A steel meter scale is to be ruled so hat millimeter intervals are accurate within about $5 \times 10^{-5}m$ at a certain temperature. The maximum temperature variation allowable during the ruling is: (Coefficient of linear expansion of steel = $10 \times 10^{-6} K^{-1}$)

asked Dec 11, 2018 by pady_1

1 answer

A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is :

asked Dec 11, 2018 by pady_1

0 answers

The displacement of a particle varies according to the relation $x=4 (\cos \pi t + \sin \pi t)$. The amplitude of the particle is :

asked Dec 11, 2018 by pady_1

0 answers

For each $t \in R$ let $[t]$ be the greatest integer less than or equal to $t$. Then $ \displaystyle\lim_{x \to 0^-} x$ $\begin{pmatrix} [\frac{1}{x} +[\frac{2}{x}] +....+[\frac{15}{x}] \end{pmatrix}$

asked Dec 11, 2018 by pady_1

1 answer

In the given circuit diagram when the current reaches steady state in the circuit, the charge on the capacitor of capacitance C will be :

asked Dec 11, 2018 by pady_1

0 answers

The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of :

asked Dec 11, 2018 by pady_1

1 answer

Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN), and so forth. X is :

asked Dec 11, 2018 by pady_1

0 answers

The area of the region described by $A = \{(x, y) : x^2 + y^2 \leq 1$ and $y^2 \leq 1 - x\}$ is

asked Dec 11, 2018 by pady_1

1 answer

If $P = \begin{bmatrix} 1 & \alpha & 3 \\ 1 & 3 & 3 \\ 2 & 4 & 4 \end{bmatrix}$ is the adjoint of a $3 \times 3$ matrix A and $|A| = 4$, then $\alpha$ is equal to

asked Dec 11, 2018 by pady_1

1 answer

A radar has a power of 1 Kw and is operating at a frequency of 10 GHz. It is located on a mountain top of height 500 m. The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth = $6.4 \times 10^{6} m$ ) is

asked Dec 11, 2018 by pady_1

0 answers

If C and D are two events such that $C \subset D$ and $P(D) \neq 0$, then the correct statement among the following is

asked Dec 11, 2018 by pady_1

0 answers

The potential energy function for the force between two atoms in a diatomic molecule is approximately given by $U(x) = \frac{a}{x^{12}} - \frac{b}{x^6}$, where $a$ and $b$ are constants and $x$ is the distance between the atoms. If the dissociation energy of the molecule is $D = [U_{(x = \infty)} - U_{at\; equilibrium}], \; D$ is

asked Dec 11, 2018 by pady_1

1 answer

In context with the transition elements, which of the following statements is incorrect ?

asked Nov 29, 2018 by pady_1

0 answers

For the following three reactions a, b and c, equilibrium constants are given a. $CO(g)+ H_2O(g) =CO_2 (g) + H_2 (g); K_1$ b . $CH_4 (g) + H_2O(g) =CO(g) + 3H_2 (g); K_2$ c. $CH_4 (g) + 2H_2O(g) = CO_2 (g) + 4H_2(g); K_3$ Which of the following relations is correct?

asked Nov 29, 2018 by pady_1

0 answers

If in a $p-n$ junction diode, a square input signal of 10 V is applied as shown : Then the output signal across $R_L$ will be :

asked Nov 29, 2018 by pady_1

0 answers

Two spherical conductors A and B of radii 1 mm and 2 mm are separated by distance of 5 cm and are uniformly charged. If the spheres are connected by a conducting wire then in equilibrium conditon, the ratio of the magnitude of the electric fields at the surfaces of spheres A and B is :

asked Nov 13, 2018 by pady_1

0 answers

A circle touches the $x-axis$ and also touches the circle with centre at (0, 3) and radius 2. The locus of the centre of the circle is :

asked Nov 5, 2018 by pady_1

0 answers

Two sources of equal emf are connected to an external resistance $R$. The internal resistances of the two sources are $R_1$ and $R_2 (R_2 > R_1)$. If the potential difference across the source having internal resistance $R_2$, is zero, then :

asked Nov 5, 2018 by pady_1

0 answers

A variable circle passes through the fixed point $A(p, q)$ and touches x-axis. The locus of the other end of the diameter through A is

asked Nov 5, 2018 by pady_1

0 answers

Nitrogen of aniline in strong acidic medium also gives m-nitroaniline because

asked Aug 21, 2018 by pady_1

1 answer

A gene whose expression helps to identify transformed cell is known as

asked Aug 21, 2018 by pady_1

1 answer

The Avena curvature is used for bioassay of

asked Aug 21, 2018 by pady_1

1 answer

Most animals that live in deep oceanic waters are -

asked Aug 21, 2018 by pady_1

1 answer

Which property of colloids is not dependent on the charge on colloidal particles?

asked Aug 20, 2018 by pady_1

1 answer

A reaction having equal energies of activation for forward and reverse reactions has -

asked Aug 20, 2018 by pady_1

2 answers

Transfer characteristics [output voltage $(V_0)$ vs input voltage $(V_i)$] for a base biased transistor in CE configuration is as show in the figure. For using transistor as a switch, it is used.

asked Aug 20, 2018 by pady_1

1 answer

Symbolic representation of four logic gates are shown as : Pick out which ones are for AND, NAND and NOT gates, respectively :

asked Aug 16, 2018 by pady_1

1 answer

To get an output Y = 1 from the circuit shown below, the input must be â€“

asked Jul 26, 2018 by pady_1

1 answer

A transistor is operated in common-emitter configuration at $V_c=2V$ such that a change in the base current from 100 µA to 200 µA produces a change in the collector current from 5 mA to 10 mA. The current gain is :

asked Jul 26, 2018 by pady_1

2 answers

A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of $10 \Omega$. Its internal resistance is -

asked Jul 26, 2018 by pady_1

1 answer

For a cubic crystal structure which one of the following relations indicting the cell characteristic is correct :-

asked Jul 26, 2018 by pady_1

2 answers

Two bodies, A(of mass 1kg) and B(of mass 3kg), are dropped from heights of 16 m and 25 m respectively. The ratio of the time taken by them to reach the ground is:-

asked Jul 25, 2018 by pady_1

1 answer

A ball is thrown vertically up ward. It has a speed of 10m/sec when it has reached one half of its maximum height. How high does the ball rise? Take g = $10=m/s^2-$

asked Jul 24, 2018 by pady_1

2 answers

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 :-

asked Jul 24, 2018 by pady_1

1 answer

Following diagram performs the logic function of :

asked Jul 24, 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

Energy is released in nuclear fission is due to

asked Jul 20, 2018 by pady_1

1 answer

Which pair have not equal dimensions :

asked Jul 20, 2018 by pady_1

1 answer

A particle, with restoring force proportional to displacement and resisting force proportional to velocity is subjected to a force F sin $\omega$t. If the amplitude of the particle is maximum for $\omega$ = $\omega_{1}$ and the energy of the particle maximum for $\omega$ = $\omega_{2}$, then :

asked Jun 15, 2018 by pady_1

1 answer

A truck departs from a distribution centre. From there, it goes 2 kilometres north, 7 kilometres south, 2 kilometres east, and 5 kilometres north. How many kilometres is the truck from the distribution centre?

asked Dec 31, 2015 by pady_1

1 answer

7 of the people in Gabe's flat building like beetles. 6 people like spiders, and 5 people like both beetles and spiders. How many people like beetles or spiders or both?

asked Dec 31, 2015 by pady_1

0 answers

A snail crawls 30 cm in 20 minutes. It crawls another 49 cm in 32 minutes. How many metres does it travel in the total time?

asked Dec 31, 2015 by pady_1

0 answers

There are 31 students in class 5. There are 12 boys in the class. What is the fraction of girls in the class ?

asked Dec 31, 2015 by pady_1

0 answers

So far, an orchard has sold a total of 15,034 kilograms of fresh fruit and 35,730 kilograms of frozen fruit this season. In total, how many kilograms of fruit have been sold?

asked Dec 31, 2015 by pady_1

0 answers

The variance of first 50 even natural numbers is :

asked Mar 31, 2015 by priyal_dps

1 answer

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