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Questions >> EAMCET >> Physics

The machine gun fires 240 bullets per minute. If the mass of each bullet is 10 g and the velocity of the bullets is $600\; ms^{-1}$ the power (in kW) of the gun is :

asked Nov 7, 2013 by meena.p

1 answer

The equation of trajectory of a projectile is $y= 10 x - \bigg(\large\frac{5}{9} \bigg)x^2$. If we assume $g=10\;ms^{-2},$ the range of projectile (in meter) is :

asked Nov 7, 2013 by meena.p

0 answers

The equation of trajectory of a projectile is $y=10x-\bigg(\large\frac{5}{9}\bigg)x^2$. If we assume $g=10\;ms^{-2}, the range of projectile (in metre) is :

asked Nov 7, 2013 by meena.p

0 answers

A body projected vertically upwards crosses a point twice in its journey at a height h just after $t_1$ and $t_2$ seconds. Maximum height reached by the body is :

asked Nov 7, 2013 by meena.p

1 answer

At a given instant of time the position vector of a particle moving in a circle with a velocity $3 \hat i- 4 \hat j + 5 \hat k$ is $\hat i+9 \hat j -3 \hat k$. Its angular velocity at that time is :

asked Nov 7, 2013 by meena.p

1 answer

Names of units of some physical quantities are given in List I and their dimensions formulae are given in List- II. Match the correct pairs in the lists:

asked Nov 7, 2013 by meena.p

1 answer

A zener diode voltage regulator operated in the range 120 - 180 V produces a constant supply of 110 V and 250 mA to the load. If the maximum current is to be equally shared between the load and zener, then the value of series resistance $(R_S)$ and load resistance (R_L)$ are :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

Two deuterium nuclei each of mass 'm' fuse together, to form a Helium nucleus, releasing an energy E . If 'c' is the velocity of light , the mass of Helium nucleus formed will be :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

When a light of photons of energy 4.2 eV is incident on a metallic sphere of radius 10 cm and work function 2.4 eV , photoelectrons are emitted. The number of photoelectrons liberated before the emission is stopped , is $(e=1.6 \times 10^{-19}C\: and \: \large\frac{1}{4 \pi \varepsilon_{\circ}} = 9 \times 10^9\: N-m^2/Coulomb^2)$ :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

When two electrons enter into a magnetic field with different velocities, they deflect in different circular paths, in such a way that the radius of one path is double that of the other $ 1 \times 10^7\: ms^{-1}$ is the velocity of the electron in smaller circle of radius $ 2 \times 10^{-3} m$ . The velocity of electron in the other circular path is :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

A long straight vertical conductor carries a current of 8 A in the upward direction. What is the magnitude of the resultant magnetic induction at a point in the horizontal plane at a distance of 4 cm from the conductor towards south ?

asked Nov 4, 2013 by thanvigandhi_1

1 answer

A series LCR circuit is connected to a source of alternating emf 50 V and if the potential differences across inductor and capacitor are 90 V and 60 V respectively, the potential difference across resistor is :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

If $ \overline B$ is the magnetic induction, at the centre of a circular coil of radius 'r' carrying a current is 1 T then its value at a distance of $ \sqrt 3 \: r$ on the axis from the centre of the coil is:

asked Nov 4, 2013 by thanvigandhi_1

1 answer

In the thermocouple, cold junction is at $0^{\circ}C$, hot junction is at $t^{\circ}C$. The graph drawn between thermo - emf (E) and temperature of the hot junction (t) is represented by the equation , $E=at+bt^2$. If $ a = -224b$ the neutral and the inversion temperatures of the thermocouple respectively, in degree celsius are :

asked Nov 4, 2013 by thanvigandhi_1

1 answer

A battery of emf 'E' and internal resistance 'r' is connected to a resistor of resistance $'r_1'$ and Q Joules of heat is produced in a certain time 't'. When the same battery is connected to another resistor of resistance $'r_2'$ the same quantity of heat is produced in the same time 't'. Then, the value of 'r' is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

In the circuit shown in figure, the ammeter shows 5 A current, voltmeter shows 250 v and the internal resistance of the voltmeter is 2500 $ \Omega$ then the value of R is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

Consider a parallel plate capacitor of capacity 10 $ \mu\: F$ filled with air. When the gap between the plates is filled partly with a dielectric constant 4, as shown in figure.The new capacity of the capacitor is ( A is the area of plates ) :

asked Nov 2, 2013 by thanvigandhi_1

2 answers

Four positive point chargers (+q) are kept at the four corners of a square of side 'l' . The net electric field at the midpoint of any one side of the square is , $ \bigg( take\: \large\frac{1}{4 \pi \varepsilon_{\circ}} = K \bigg)$

asked Nov 2, 2013 by thanvigandhi_1

1 answer

A bar magnet of moment M gives a time period 'T' at a place in a vibration magnetometer. Four such similar bar magnets are placed in the frame one over the other out of which one magnet is placed with opposite polarity. The new time period is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

P-V diagram of an ideal gas is shown in figure. Work done by the gas in the process ABCD is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

When a liquid filled in two vessels A and B of equal volumes, is heated, the coefficients of apparent expansions of the liquids are found to be $ \gamma_1\: and \: \gamma_2$ respectively. If $ \alpha_1$ be the coefficient of linear expansion of A, then the coefficient of linear expansion of B will be :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

At $ 10^{\circ}C$, the value of the density of a fixed mass of an ideal gas divided by its pressure is 'x' . At $110^{\circ}C$ this ratio is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

A liquid flows through two capillary tubes A and B connected in series. The length and radius of B are twice that of A. The ratio of pressure difference across A and across B is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

The surface energy of a liquid drop is E. It is sprayed into 1000 equal droplets. Then their surface energy is

asked Nov 2, 2013 by thanvigandhi_1

1 answer

An Aluminium and Copper wire of same cross sectional area but having lengths in the ratio 2 : 3 are joined end to end. This composite wire is hung from a rigid support and a load is suspended from the free end. If the increase in length of the composite wire is 2.1 mm , the increase in lengths of Aluminium and Copper wires are : [$ Y_{AI} = 20\times 10^{11}N/m^2\: and \: Y_{Cu} = 12 \times 10^{11} N/m^2]$

asked Nov 2, 2013 by thanvigandhi_1

1 answer

The time period of a simple harmonic motion is 8s. At t=0 , it is at its equilibrium position. The ratio of distances traversed by it in the first and second seconds is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

A body is projected vertically upwards from the surface of the earth with a velocity equal to $\large\frac{3}{4}$th escape velocity of earth. If 'R' is the radius of earth, the maximum height attained by the body is :

asked Nov 2, 2013 by thanvigandhi_1

2 answers

A wheel of radius 0.5 m rolls without sliding on a horizontal surface, starting from rest, the wheel moves with constant acceleration $6\: rad/s^2$ . The distance travelled by the centre of the wheel from $ t = 0 \: to \: t=3s$ is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

Two circular rings of equal mass (m) and radius (r) are placed side by side, touching each other. The moment of inertia of the system about tangential axis in the plane of system passing through point of contact of the rings is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

A uniform chain of length 'l' is placed on a rough table, with its length $ \large\frac{l}{n} ( n > 1)$ hanging over the edge of the table. If the chain just begins to slide off the table by itself, the coefficient of friction between the chain and the table is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

A uniform metal disc of diameter 24 cm is taken and out of it a disc of diameter 8 cm is cut off from the right side end. The centre of mass of the remaining part will be at :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

A shell is fired from a cannon with a velocity 'v' at an angle $ '\theta'$ with the horizontal. At the highest point in its path it explodes into two pieces of equal masses. One of the pieces retraces its path and reaches the cannon. Then the velocity of the other piece immediately after collision is :

asked Nov 2, 2013 by thanvigandhi_1

1 answer

A bullet is fired normally towards an immovable wooden block. It loses 25% of its kinetic energy in penetrating through a thickness 'x' of the plank. The total thickness penetrated by the bullet into the block is :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

The acceleration of 3 kg mass in figure shown is ( assume $g = 10 m/s^2 )$ :

asked Nov 1, 2013 by thanvigandhi_1

0 answers

A ball is dropped into a well. The water level in the well is at a depth 'h' below the top. If the speed of sound is V, then after what time the splash of sound is heard?

asked Nov 1, 2013 by thanvigandhi_1

2 answers

Two vectors are $( \overrightarrow A + \overrightarrow B)$ and $( \overrightarrow A - \overrightarrow B)$. The angle between their resultant vector and $ \overrightarrow A $ is :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

Match the following physical quantities with their respective dimensional formula :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

A magnet of length 10 cm and magnetic moment $1 Am^2$ is placed along the side AB of an equilateral triangle ABC. If the length of sides AB is 10 cm, the magnetic induction at point C is :

asked Nov 1, 2013 by thanvigandhi_1

2 answers

Two polarizers have their axis inclined at $ 45^{\circ}$ to each other. If unpolarized light of intensity $I_{\circ}$ is incident on the first polarizer , then the intensity transmitted light through second polarizer is :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

When a light of wavelength 4000 A in vacuum travels through the same thickness in diamond and water separately, the difference in the number of waves is 200. Find the thickness, if refractive indices of diamond and water are $ \large\frac{5}{2}\: and \: \large\frac{4}{3}$ respectively :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

A thin bi-convex lens of focal length 20 cm is made of glass of refractive index 1.5, when it is dipped in a liquid of refractive index $ \large\frac{9}{8} $, it acts as :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

A water film is formed on a glass-block. A light ray is incident on water film from air at an angle $60^{\circ}$ with the normal. The angle of incidence on glass slabs is $ \bigg[ \: given\: \mu_g = 1.5,\: \mu_W = \large\frac{4}{3} \bigg] $ :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

Two identical flutes produce fundamental notes of frequency 300 Hz at $27^{\circ}C$. If the temperature of the air in one of the flutes is increased to $31^{\circ}C$, the number of beats heard per seconds will be :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

A source of sound producing wavelength 50 cm is moving away from a stationary observer with $ \large\frac{1}{5}th$ speed of sound. Then what is the wavelength of sound heard by the observer?

asked Nov 1, 2013 by thanvigandhi_1

1 answer

The temperature of a perfect black body is $727^{\circ}C$ and its area is $0.1\: m^2$. If Stefan's constant is $ 5.67 \times 10^{-8} W/m^2K^4$, then heat radiated by it in $0.3$ minutes is :

asked Nov 1, 2013 by thanvigandhi_1

1 answer

Two cylinders A and B, fitted with pistons. A and B contain equal moles of an ideal monoatomic gas at 400 K. Piston in A is free to move, while piston in B is held fixed. Same amount of heat is given to the gas in each cylinder. If the rise in temperature of the gas in A is 42 K, then the increase in the temperature of the gas in B is $ \bigg( \gamma = \large\frac{5}{3} \bigg) $:

asked Nov 1, 2013 by thanvigandhi_1

1 answer

Consider a p-n junction as a capacitor, formed with p and n-materials acting as thin metal electron and depletion layer width acting as separation between them. Basing on this , assume that n-p-n transistor is working as an amplifier in CE configuration . If $C_1$ and $C_2$ are the base - emitter and collector- emitter junction capacitances, then:

asked Oct 29, 2013 by meena.p

1 answer

A free neutron decays spontaneously into:

asked Oct 29, 2013 by meena.p

1 answer

A proton, a deuteron (nucleus of $_1 H^2$) and an $\alpha$- particle with same kinetic energy enter a region of uniform magnetic field moving at right angles to the field. The ratio of the radii of their circular paths is :

asked Oct 29, 2013 by meena.p

1 answer

A oil drop having a mass $4.8 \times 10^{10}\;g$ and charge $2.4 \times 10^{-18}\;C$ stands still between two charged horizontal plates separated by a distance of 1 cm. If now the polarity of the plates is changed, instantaneous acceleration of the drop is : $(g= 10 ms^{-2}$)

asked Oct 29, 2013 by meena.p

1 answer

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