121- Amount of heat absorbed,when one mole of liquid changes to gas at its boiling point is called?
A. Molar heat of sublimation
B. Heat of vaporization
C. Latent heat of fusion
D. Heat capacity
View Answer
Answer : B. Heat of vaporization
Description
122- A well-known physical change is melting of ice.The melting of ice is favored by?
A. Lower P, high T
B. Low T, high P
C. High T, high P
D. Low T, low P
View Answer
Answer : A. Lower P, high T
Description
123- law states that the magnitude of the force between 2-pint charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them?
A. Ohm’s law
B. Gauss law
C. Coulomb’s law
D. Len’s law
View Answer
Answer : C. Coulomb’s law
Description
124- A ball thrown vertically upwards will have constant____ and a varying ____.
A. Velocity and acceleration
B. Kinetic energy, velocity
C. Acceleration, velocity
D. Kinetic energy and acceleration
View Answer
Answer : C. Acceleration, velocity
Description
125- A boy raises an object of mass 10Kg vertically above his head through a height of 5m.the potential energy stored in the body is:
A. 49j
B. 98j
C. 490j
D. 980j
View Answer
Answer : C. 490j
Description
126- A magnetic is suspended from a spring and its oscillates in and out of a coil placed vertically below it.A galvanometer is connected to the coil and it shows?
A. No deflection
B. Deflection on one side only
C. Deflection to the left and right with constant amplitude
D. Reflection to the left and right with decreasing amplitude
View Answer
Answer : D. Reflection to the left and right with decreasing amplitude
Description
127- A man standing in an elevator at the third floor of a building what is the primary factor that determines the man’s kinetic energy?
A. High height above the ground
B. His mass
C. Elevator’s speed
D. Elevator’s direction of movement
View Answer
Answer : C. Elevator’s speed
Description
128- A resister has a resistance of 200 ohms.If a current of 0.5 amperes flows through it, what is the voltage drop across the resistor?
A. 400 volts
B. 110 volts
C. 120 volts
D. 0.002 volts
View Answer
Answer : B. 110 volts
Description
129- A three-dimensional image of remarkable quality can be achieved by modern version of microscope called:
A. Compound microscope
B. Simple microscope
C. Transmission electron microscope
D. Scanning electrons microscope
View Answer
Answer : D. Scanning electrons microscope
Description
130- A train travels on a straight track passing signal A at 20 m/s.it accelerates uniformly at 2 m/s² and reaches signal 100m further than A, at B the velocity of the train in m/s is:
A. 10
B. 20
C. 28
D. 56
View Answer
Answer : C. 28
Description
131- A wave is characterized by three physical parameters:
A. Amplitude, wavelength and acceleration
B. Frequency, wavelength and acceleration
C. Wavelength, frequency and speed of wave
D. Displacement, wavelength and speed of wave
View Answer
Answer : C. Wavelength, frequency and speed of wave
Description
132- Accelerating electromagnetic charges radiate electromagnetic waves which propagate at the:
A. Speed of electromagnetic waves
B. Frequency of light
C. Speed of light
D. Frequency of electromagnetic waves
View Answer
Answer : C. Speed of light
Description
133- K-a rays are generated when transition of an electron occurs from:
A. K to M shell
B. L to M shell
C. L to K shell
D. M to L shell
View Answer
Answer : C. L to K shell
Description
134- The decay constant of sodium (Na) is 0.000128 /s. the half-life of sodium is:
A. 15 hours
B. 5 hours
C. 900 s
D. 3600 s
View Answer
Answer : D. 3600 s
Description
135- At the end of 14 min, 1/16 of a sample of radioactive polonium remains. The corresponding half-life is:
A. (7/8) min
B. (8/7) min
C. (7/4) min
D. (7/2) min
View Answer
Answer : D. (7/2) min
Description
136- According to Bohr’s model of the hydrogen atom, electrons move in specific orbit around the nucleus called:
A. Quanta
B. Shell
C. Clouds
D. Wavelength
View Answer
Answer : B. Shell
Description
137- According to first law of thermodynamics. What is the relationship between the change in the internal energy of a closed system ∆U, the heat added to the system (Q) and the work done by the system (W):
A. ∆U = Q + W
B. ∆U = Q – W
C. ∆U = QxW
D. ∆U = Q/W
View Answer
Answer : B. ∆U = Q - W
Description
138- Angular displacement is measured in ?
A. Degrees
B. Revolution
C. Radius
D. All of these
View Answer
Answer : D. All of these
Description
139- Centrifugal force:
A. mv²/r
B. m²v/r
C. mv/r²
D. mvZ/r
View Answer
Answer : A. mv²/r
Description
140- circular periodic waves can be generated:
A. in a ripple tank using spherical dippers
B. using electromagnetic vibrator
C. by giving sudden up and down movement to a rope with one fixed end
