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IIT Advance Physics Quiz

Q1.A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold, then, an electric current will
(a) flow from Antimony to Bismuth at the hot junction
(b) flow from Bismuth to Antimony at the cold junction
(c) now flow through the thermocouple
(d) flow from Antimony to Bismuth at the cold junction

Q2. A thin glass (refractive index 1.5) lens has optical power of – 5 D in air. Its optical power in a liquid medium with refractive index 1.6 will be
(a) – 1D
(b) 1 D
(c) – 25 D
(d) 25 D

Q3. A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, the angular speed of the disc.
(a) continuously decreases
(b) continuously increases
(c) first increases and then decreases
(d) remains unchanged

Q4. A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was
(a) 256 + 2 Hz
(b) 256 – 2 Hz
(c) 256 – 5 Hz
(d) 256 + 5 Hz

Q5. A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?  
(a) 12 J
(b) 3.6 J
(c) 7.2 J
(d) 1200 J

Q6. A wave y = α sin(ωt–kx) on a string meets with another wave producing a node at x =0. Then the equation of the unknown wave is
(a) y = α sin(ωt + kx)
(b) y = – α sin(ωt + kx) (c) y = α sin(ωt – kx) (d) y = -α sin(ωt – kx)

Q7. A wire elongates by l mm when a load W is hanged from it. If the wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be (in mm)
(a) l
(b) 2l
(c) zero
(d) l/2

Q8. A wire when connected to 220 V mains supply has power dissipation P1. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is P2. Then P2: P1 is
(a) 1
(b) 4
(c) 2
(d) 3

Q9. A working transistor with its three legs marked P, Q and R is tested using a multimeter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?
(a) It is an npn transistor with R as base
(b) It is a pnp transistor with R as collector
(c) It is a pnp transistor with R as emitter
(d) It is an npn transistor with R as collector

Q10. According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal Vs the frequency, of the incident radiation gives as straight the whose slope
(a) depends both on the intensity of the radiation and the metal used
(b) depends on the intensity of the radiation
(c) depends on the nature of the metal used
(d) is the same for the all metals and independent of the intensity of the radiation

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