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Practice Physics GS Questions and Answers

The amount of light entering in eye is controlled by:
Which of the following is the ultimate source of energy?
If radius of earth is R then the height ‘h’ at which the value of ‘g’ becomes one-fourth is-
A stone thrown upward with a speed ’u’ from the top of the tower reaches the ground with a speed ‘3u’. The height of the tower is-
Two cars A and B are running at velocities of 60km per hour and 45 km per hour. What is the relative velocity of car A with respect to car B, if both are m...
A stream of water flowing horizontally with a speed of 20 m/s pushes out of a tube of cross-sectional area 10-1m2 and hits at a vertical wall nearby. Find ...
Two spherical soap bubbles of radii r1 and r2 coalesce to form a bubble of radius R. If surface tension of soap solution is T, atmospheric pressure is P. c...
Which of the following electromagnetic waves are used for detection like Geiger tubes?
Which of the following statement is true for a wavelength of 1000 nm. A p-n photodiode is fabricated from a semiconductor with band gap of 1.9 eV.
A pulse of light duration 10-5 s is absorbed fully by a little object initially at rest. If the power of this pulse is 45 × 10-3 W, compute the final mome...
Light from a point source in air falls on a spherical glass surface (n=1.5 c and radius of curvature = 10 cm). The distance of the light source from the gl...
A stone of mass 0.3 kg tied to the end of a string is whirled round in a circle of radius 1.2 m with a speed of 20 rev./ mim in a horizontal plane. What is...
Let the electric field part of an electromagnetic wave is E = {(2.3 N/C) cos [(1.2 rad/m) y + (2.4 × 108 rad/s)t]} î. Compute the value of wavelength, f...
Figure-out the case from the following in which the rope will break if an animal of mass 30 kg climbs on a rope, which can stand a maximum tension of 560 N...
Water flows in a horizontal pipe of non-uniform area of cross-section at a pressure difference of 1.6 cm of mercury. If the velocity of water at the larger...
The radii of curvature of the faces of a double convex lens are 20 cm and 30 cm. If focal length of the lens is 36 cm find the refractive index of the m...
In a plane electromagnetic wave. the electric field oscillates sinusoid ally at a frequency of 3 × 108 Hz and amplitude 36 V/m. Find the amplitude of the ...
A train runs along an unbanked circular track of radius of 10 m at speed of 36 km/h. The mass of the train is 16 kg. What is the angle of banking required...
A galvanometer coil has a resistance of 14 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into a voltme...
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A brass boiler has a base area of 0.2 m2 and thickness 1.0 cm. It boils water at the rate of 6.0 kg/min when placed on a stove. Calculate the temperature o...
The coefficient of volume expansion of glycerin is 49 × 10-5 K-1. Find the fractional change in its density for a 20°C rise in temperature? ...
Which of the following statement is INCORRECT regarding the comparison between biot-savart law for the magnetic field and coulomb's law for the electrostat...
For CE-transistor amplifier, the audio signal voltage across the collected resistance of 3 k Ω is 3V. Assume the current amplification factor of the trans...
Assume a parallel plate capacitor which is maintained at potential of 100 V. If the partition distance between the plates of the capacitor and area of the ...
A ray of light passing through an equilateral triangular glass prism from air undergoes minimum deviation when angle of incidence is 75% of the angle of pr...
The diameter of a capillary is 4mm. If Reynolds's number of the tube is 1000 and the co-efficient of viscosity for water is 0.02 poise, determine the maxim...
Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 12 and the second has a voltage gain of 15...
A copper block of mass 3 kg is heated in a furnace to a temperature of 450°C and then placed on a large ice block. Find the maximum amount of ice that can...
A toroid has a core (non-ferromagnetic) of inner radius 23 cm and outer radius 28 cm, around which 4000 turns of a wire are wound. If the current in the wi...
How does the angle of minimum deviation of a glass prism of refractive index 1.5 change, if it is immersed in a liquid of refractive index 1.25?
In order to use the transistor as an amplifier, it has to operate in the____ region
A sphere of radius 1m encloses a charge of 10μC. Another charge of −5μC is placed inside the sphere. The net electric flux would be :
An electric dipole of length 10 cm, when placed with its axis making an angle of 30° with a uniform electric field, experiences a torque of 2√3 N...
Specific resistance of a conductor increases with :
For a cell terminal potential difference is 3.5 V when circuit is open and reduces to 2.5 V when cell is connected to a resistance of R = 10Ω then de...
Consider the following two statements (A) Kirchhoff's junction law follows from the conservation of charge. (B) Kirchhoff's loop law follows from the conse...

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