Physics - Online Test
Q1. One mole of hydrogen gas is heated at constant pressure from 300 K to 420 K. Calculate the energy transferred by heat to the gas
Answer : Option B
Explaination / Solution:
Hydrogen is a diatomic gas. (CP = 3.5R)
energy transferred by heat to the gas
Q2. What is the relation between refractive indices , 1 and 2 if the behavior of light rays is as shown in the following figure?
Answer : Option B
Explaination / Solution:
No Explaination.
Q3. If 10 of a substance decays in 10 days, then approximate percentage of substance left after 24 days is
Answer : Option B
Explaination / Solution:
No Explaination.
Q4. A steel railroad track has a length of 30.000 m when the temperature is 0.0C.Suppose that the ends of the rail are rigidly clamped at 0.0C so that expansion is prevented. What is the thermal stress set up in the rail if its temperature is raised to 40.0C?
Answer : Option C
Explaination / Solution:
Thermal Stress
Q5.
A physical quantity P is related to four observables a, b, c and d as follows : The percentage errors of measurement in a, b, c and d are 1, 3, 4 and 2, respectively. What is the percentage error in the quantity P?
Answer : Option A
Explaination / Solution:
Value of P is given as 3.763.
By rounding off the given value to the first decimal place,
we get P = 3.8.
Q6. You have a 200.0 Ω resistor, a 0.400-H inductor, 5.0 μF a capacitor, and a variable frequency ac source with an amplitude of 3.00 V. You connect all four elements together to form a series circuit. Current amplitude at an angular frequency of 400 rad/s is
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. The length of a second’s pendulum decreases by 0.1percent, then the clock
Answer : Option A
Explaination / Solution:
No Explaination.
Q8. A bar magnet of magnetic moment 1.5 J/T lies perpendicular to the direction of a uniform magnetic field of 0.22 T. What is the torque acting on it?
Answer : Option D
Explaination / Solution:
No Explaination.
Q9. The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3.0)
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointed in the same direction
Answer : Option A
Explaination / Solution:
The force experienced by an electron in a combined action of magnetic and electric fields is .Since the electron moves in the same direction of the magnetic field, it experiences no force due to the magnetic field..The electron is not deflected from its straight line path. The total force on the electron..It experiences a force opposite to the direction of the electric field and to its direction of motion. The electron suffers retardation and its velocity decreases.
