Mix Test - 7...

The reading of the ammeter in the given circuit is

A box is gently placed on a horizontal conveyor belt moving with a speed of 4 ms^–1. If the coefficient of friction between the box and the belt is 0.8, then through what distance will the block slide without slipping? Take g = 10 ms^–2

If the distance between Earth and the sun becomes 4 times as much, then the time period of revolution will become

The resistance of a wire of length L is R. If the wire is stretched to increase its length to 4L, then what will be the new resistance of the wire?

For a transistor, the current gain is 0.96. It is used as an amplifier in a common base circuit with a load resistance of 4 k. If the dynamic resistance of the emitter-base junction is 48 , then the voltage gain is

A ball falling from a tower of height 'h' covers a distance h/2 in the last second of its motion. What is the height of the tower? (Take g = 10 ms^–2)

The time period 't' of a drop of liquid of density 'd' and radius 'r', vibrating under surface tension 's', is given by the formula t = . If a = 1 and c = -1, then b is

A thin prism P₁ with angle 4° is made from a glass of refractive index 1.54 combined with another thin prism P₂ made from a glass of refractive index 1.72 to produce dispersion without deviation. The angle of prism P₂ is

In an inductor, the current I (in amperes) varies with time t (in seconds) as:
I = 5 + 16t.
If the emf induced in the inductor is 10 mV, then what is its self inductance?

When one of the slits in Young's experiment is covered with a transparent sheet of thickness 3.6 10^-3 cm, the central fringe shifts to a position originally occupied by the 30^th bright fringe. If = 6000 , then the refractive index of the sheet is

Two springs A and B have force constants k₁ and k₂, respectively. The ratio of the work done on A to that done on B, when they are stretched by the same force, is

A rod, 1 m long, made of a material of thermal conductivity 420 W/m/K has one of its ends in melting ice and the other end in boiling water. If its cross-sectional area is 10 cm², then the amount of ice that melts in 1 minute is

An α–particle of energy 5 MeV is scattered through 180^o from a fixed uranium nucleus. The distance of closest approach is of the order of

Three thin metal rods, each of mass M and length L, are welded to form an equilateral triangle. The moment of inertia of the composite structure, about an axis passing through the centre of mass of the structure and perpendicular to its plane, is

The effective capacitance of two capacitors of capacitances C₁ and C₂ (with C₂ > C₁) connected in series is times the effective capacitance when they are connected in parallel. The ratio of C₂ to C₁ is