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F_(1) and F_(2) are focal length of objective and eyepiece respectively of the telescope. The angular magnification for the giventelescope is equal to

A bird flies down vertically towards a water surface. To a fish inside the water, vertically below the bird, the bird will appear to

A box is dragged along a horizontal floor by a rope which makes an angle of 60° with the horizontal. How much work is done if the tension in the rope is 150 N and the box is dragged through a distance of 10 m.

In the previous question, if the current is I and the magnetic field at D has magnitude B .

_____ is the SI unit of capacitance.

Two choherent waves represented by y_(1) = A sin((2pi x_(1))/lambda - wt + pi/4) and y_(2) = A sin((2pix_(2))/lambda - wt + pi/6) are superposed. The two waves will produce:

A boat is sent across the river with a velocity of 8 km/h. in a direction perpendicular to flow of river. If resultant velocity of boat is 10 km/h, then velocity of river flow is :

Consider the following statements : Sound waves can undergo 1. reflection 2. refraction 3. interference

If V=V_(m)sin omegat represents instantaneous voltage connected across a resistor of resistance 'R' then write the expression for the instantaneous current in it.

According to Rutherford model of atom the atom consists of ____ .

Calculate the amount of sugar dissolved in 10^(-3)m^(3) of water so as to produce ratation of plane of polarisation of 12^(@). Given the specific rotation of sugar solution is0.01 rad m^(-1) kg^(-1) m^(3) and length of polarimeter tube is 0.21m

For a cell, the graph between the p.d.(V) across the terminals of the cell and the current I drawn from the cell is shown in the fig. the emf and the internal resistance of the cell is E and r respectively.

State Curie's law for a paramagnetic substance.

Name the gate, which represent the Boolean expressiony=bar(A*B)

A disc of mass 2 kg is rollng on a horizontal surface without slipping with a velocity of 0.1 m//s. What is it's rotational kinetic energy ?

Which of the following option for diatoms is correct?

The lesson "His First Flight" is about a...........

Figure 2.32 shows a charge array known as an electric quadrupole. For a point on the axis of the quadrupole, obtain the dependence of potential on r for r//a gt gt 1 , and contrast your results with that due to an electric dipole, and an electric monopole (i.e., a single charge).

पुष्पों की कृषि, प्रजनन, क्रय-विक्रय और स्था के विज्ञान को कहते हैं

Three batteries of emf 4,5 and 6V and internal resistances 1,2 and 3Omega respectively are connected in parallel with each other and the combination sends a current through an external resistance of 4Omega. Find current drawn through each battery.

Why a thick metal plate oscillating about a horizontal axis stops when a strong magnetic field is applied on the plane?

Two ships A and B are 4 km apart. A is due west of B. If A moves with a uniform velocity of 8 km hr^(-1) due east and B moves with a uniform velocity of 6 km hr^(-1) due south, calculate (i) the magnitude of velocity of A relative to B, (ii) the closest distance apart of A and B.

A beam of monochromatic light is incident on a glass slab at an angle of incidence of 60^@ and r=30^@ then ratio of which of beam in glass to air is:

In a single slit diffraction pattern, how does the angular width of central maxima change when distance betweenslit & screen is increased

A dipole is placed in constant electric field E as shown . If it is released from rest this position find the kinetic energy gained when it is parallel to electric field vector . ( Assume dipole is small and placed in a gravity free space ) .

In the circuit shown R_(1)=R_(2)=10Omega and resistance per unit length of wire PQ=1Omega//cm and length PQ =10 cm if R_(2) is made 20Omega the to get zero deflection in galvanometer. S is midpoint of wire PQ.

A particle of mass m rotating in a plane circular path of radius r has angular momentum L. The centripetal force acting on its is :

In alpha decay, why the unstable nucleus emits ""_(2)^(4)"He" nucleus ? Why it does not emit four separate nucleons?

What is the energy required to blow a soap bubble of radius 5 cm ? ( S.T. of soap solution = 30xx10^-2N/m.)

Questions 61 and 62 are based on following paragraph : A Young's double slit arrangement produces interference fringes for sodium light with wavelength 5890 Å that are 0.20 mm apart. 61. Their fringe angular separation in air is

When a coil is rotated in a magnetic field, with constant speed then

In the diagram shown, a wire carries current I. What is the value of the ointvecB.dvecl (as in Ampere's law) on the helical loop shown in the figure. The integration is done in the sense shown. The loop has N turns and part of helical loop on which arrows are drawn outside the plane of paper.

A wire carrying current. It is charged ?

There are about _____electrons in a charge of -1 coulomb.

A constant voltage is applied between the two ends of a uniform inetallic wire. Some heat is developed in it. The heat developed is doubled if

When a lens of refractive index n_(1) is placed in a liquid of refractive index n_(2), the lens looks to be disappeared only if

Pure Si at 300 K has hole and electron densities are 1.5 xx 10^(16)m^(-3). Electron density in the doped silicon is

A metallic resistor is connected across a battery. If the number of collisions of the free electrons with the lattice is some how decreased in the resistor (for example, by cooling it), the current will

A: The electric field induced due to changing magnetic field is non-conservative, R: The line integral of the electric field induced due to changing magnetic field along a closed loop is always zero.

The voltage applied to a purely inductive coil of self inductance 15.9 m H is given by the equation V = 100 sin 314 t + 75 sin 942t + 50 sin 1570t. Find the equation of the resulting current.

Which one among the follov,ring is not produced by sound waves in air?

Name the agency which administer the present system of frequency allocations.

Describe the Fizeau's method to determine speed of light.

An electron moves along +x direction. It enters into a region of uniform magnetic field B directed along - z direction as shown in figure. Draw the shape of trajectory followed by the electron after entering the field.

If M is the atomic mass and A is the mass number, packing fraction is given by.