Physics is the science that studies the nature and properties of matter and energy. It covers topics like motion, heat, light, sound, electricity, magnetism, and the structure of atoms.
-
Question 1201: Alternating current can induce voltage because it has a
Options:
A) ripple value
B) varying magnetic field
C) weaker magnetic field than direct current
D) stonger magnetic field than direct current
E) high peak value
Show Answer
The correct answer is D .
-
Question 1202:

In the Figure above, QR is a vertical conductor and the current I flows from R to Q, P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current is
Options:
A) Upward
B) North
C) South
D) West
E) East
Show Answer
The correct answer is D .
-
Question 1203:
A bridge made of steel is 600m long. What is the daily variation in its length if the night-time and daytime temperatures are 10oC and 35oC respectively. The linear expansivity of steel is 0.000012C-1
Options:
A) 0.18cm
B) 1.80cm
C) 18.00cm
D) 1800cm
Show Answer
The correct answer is C .
-
Question 1204: Which of the following correctly explains why soft iron is proffered to steel in electromagnets? i. soft iron is more readily magnetized than steel. ii. soft iron is more readily demagnetized than steel. iii. soft iron retains magnetism more than steel.
Options:
A) i only
B) ii and iii only
C) i and ii only
D) i, ii, and iii.
Show Answer
The correct answer is C .
-
Question 1205: In a tuned radio receiver R, L, C series circuit for resonance, the inductive and capacitive reactance XL and XC respectively are related as
Options:
A) XL = XC
B) XL = 1/2XC
C) XL = 1/XC
D) XL = 2XC
Show Answer
The correct answer is A .
-
Question 1206: Which of the following statements is correct? Silvered walls of a vacuum flask are used to prevent
Options:
A) heat loss due to conduction
B) vacuum loss
C) heat entry into the inner flask due to convection
D) heat loss due to radiation
E) heat loss due to convection
Show Answer
The correct answer is D .
-
Question 1207: In photo-emission, the number of photo-electrons ejected per second depends on the
Options:
A) frequency of the beam
B) work function of the metal
C) threshold frequency of the metal
D) intensity of the beam
Show Answer
The correct answer is C .
-
Question 1208: A simple pendulum has a period of 17.0s. When the length is shorten by 1.5m, its period is 8.5s. Calculate the original length of the pendulum
Options:
A) 4.0 m
B) 3.0 m
C) 2.0 m
D) 1.5 m
Show Answer
The correct answer is C .
-
Question 1209: A moving coil galvanometer has a full-scale deflection of 3A equivalent to 30o deflection. The sensitivity of the instrument is
Options:
A) 33.0
B) 0.1
C) 90.0
D) 10.0
Show Answer
The correct answer is D .
-
Question 1210:
A 500W heater is used to heat 0.6kg of water from 25oC to 100oC in t2 seconds. If another 1000W heater is used to heat 0.2kg of water from 10oC to 100oC in t, seconds, find
Options:
A) 50
B) 5
C) 5/4
D) 1/5
Show Answer
The correct answer is D .