List of top Physics Questions

The COP of a heat pump is 40% of a reversible heat pump. The operating temperatures limits are \(2°C\) and \(25°C\). If 2.5 kW of heat is pumped by the heat pump in a room to be heated, then the power input to the heat pump is:
Power transmitted by a V-belt drive is determined by the effective pull and the belt speed, as given by the following equation
The dispersion relation for electromagnetic waves travelling in a plasma is given by \(ω^2 = c^2k^2-ω^2_ρ\), where c and \(ω_ρ\), are constants. In this plasma, group velocity will be
Dark Current in semi-conductor photo-diode is___
From the evaporator of a vapour compression refrigerator the refrigerant leaves at 205 KJ/kg and leaves condensor at 75 KJ/kg. The cooling load in kW for supply of refrigerant per kg per second is:
The temperature distribution along a fin with insulated tip is: w
When a charge particle moves in a uniform magnetic field, its kinetic energy
If magnetic monopole existed, then which of the following Maxwell's equations will be modified?
In an open tank, water in present to a depth of 3 m and above it oil in present to a depth of 2 m. The intensity of pressure at the interface of the two fluid layers will be:
(Given specific gravity of oil = 0.7)
The r.m.s. speed of hydrogen atom at room temperature (300 K) is 2000 m/s. What is the r.m.s. speed of hydrogen atom on the surface of sun where temperature is T = 2x106 K?
Match List I with List II
LIST I
 		 LIST II
 
A. Uniform flow I.Flow through a water supply pipe.
B.Laminar flowII.Flow through a straight tube of uniform diameter and uniform roughness 
C.Turbulent flowIII. Flow above the drain hole of wash basin
D.Irrotational flow IV.Flow of blood in veins and Arteries

Choose the most appropriate answer from the options given below:

The stream function for a two-dimensional flow is given by y=2xy. the velocity at (2.2) is.
The following logic circuit represents
Logic Circuit
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The gradient of velocity at right angles to the flow is called the shear rate.
Reason R: Shear rate is also known as velocity gradient or strain raste.
In the light of the above statements, choose the correct answer from the options given below :
What is the relation between half life (T) and decay constant (\(λ\)) of a radioactive element?
Match List I with List II
List IList II
A.Temperature correction (Ct)I.\(\frac{(P_m-P_o)L}{AE}\)
B.Puel correction (Cp)II.\(\frac{h^2}{2L}\)
C.Slope correction (Ch)III.\(\alpha(T_m-T_o)L\)
D.Sag correction (Cs)IV.\(\frac{LW^2}{24n^2P_m^2}\)
Choose the correct answer from the options given below :
For a fixed voltage, the current flowing through a conductor will increase when it's____
Charge amplifier is used to amphfy the output signal of
(A) Piezoelectric Transducer
(B) Photo emissive Transducer
(C) Photo conductive Transducer
(D) Photo Voltaic Transducer
(E) LVDT
Choose the correct answer from the options given below:
When the water surface coincides the top edge of a rectangular vertical 40m (wide) x 3m (deep), then the depth of center of pressure is.
Given below are two statements:
Statement - I: The zero-air curve is non-linear.
Statement - II: The dry density at 100% saturation is non-linear function of void ratio.
In the light of the above statements, choose the correct answer from the options given below :
What will be potential and field due to a dipole of dipole moment 4.5×10-10 cm at a distance from 1 m from the center of the dipole along its axis?
Head lost due to friction is 7 m in a pipe flow. The total head at the inlet of the pipe to be maintained for maximum power transmission through the pipe is:
If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is___
The purpose of a coupling capacitor in a transistor amplifier is to___
When the speed becomes more than the synchronous speed during hunting, the damper bars develop___