An object having spherical shape of radius r experiences a retarding force F from a fluid of co-efficient of viscosity ' n• when moving through the fluid with speed v . what is the ratio of retarding force to speed
a) 6 pi n rA2 b) 6 pi p/rA2 c) 6 pi 11 I' d) 6 pi n/r
2) For interference of light waves to take place, the required condition is
a) the path difference of the light waves from the two sources must be large b) the interfering waves must be non coherentc) the light waves may come from different sourcesd) the light waves may come from two coherent sources
3)the property of bending of light around an obstacle and spreading of light waves into geometric shadow of an obstacle is called
a) diffraction b) polarization c) quantization of light d) interference of light
4) the normal human eye can focus a sharp image of an object on the eye Vct is located at certain distance called
a) least point b) near point 0 N7 c) far point d) distinct point N7 I
5) a source of sound wave emits waves of frequency 'r if % is the speed of sound waves. then what will be the wavelength of the waves
a) v/f b) of Cj c) (v-u)/f Ni7 d) (v-u)f
6) the spectrum of a star's light is masurecrar, e wavelength of one of the lines as the sodium's line is found to be S89nm. The same line harttie;i7.av velength of 497nm when observed in the laboratory. This means the star is
a) moving away from the earth b) moving towards the earth c) stationary d) revolving around the planet
7) what is the period of mass spring system during SHM if the ratio of mass to spring constant is 1/4?
a) pi b) 2pi c) 1/pi d) 1/2pi
8) a wire is stretched by a force which causes an extension . the energy is stored in it only when:
a) extension of wire is proportional to force applied b) the cross section area of the wire remains constant c) the wire is not stretched beyond its elastic limit d) the weight of wire is negligible
9) which statement is correct a) Elasticity is that property of the body which enables the body to regain its original dimension b) elasticity is that property of a body that does not allow it to return to its original shapec) Elasticity is that property of a body that allows it to retain its original shape and dimension after the stress is removed d) Elasticity is that property of a body that obeys hook's law
10) which of the following is the expression of root mean square speed of a gas having n number of molecules contained in the container? a) sq. root (V1^2 + V2A2 +V3,12 + + VnA2)/n b) (V1A2 + V2^2 +V3A2 + + VnA2)/n c) sq. root (V1 + V2 +V3 + + Vn)/n d) (V1 + V2 +V3 + + Vri)/n
11) for a gas of volume V in its equilibrium state, if the pressure does change with time then total kinetic energy of gas is constant becausea) collisions between gas molecules occur b) collisions between gas molecules occur linearly c) collisions must be elastic d) collisions must be in elastic
12) when the dimensions of both sides of an equation are equal then the equation is said to bea) simultaneous b) homogeneous c) instantaneous d) quadratic
13) two long parallel wires Wire 1 and Wire 2 repel each other what could be the reason ? a) Both carry current in same direction b) both carry current in opposite directions c) wire 1 has current but wire 2 has no current d) wire 2 has current wire 1 has no current
14) if the number of turns of a solenoid circular coil is doubled but the current in the coil and radius of the coil remains same, then what will be the magnetic flux density produced by the coil? a) magnetic flux density will be halved b) magnetic flux density increases by different amount at different points c) magnetic flux density remains unchanged d) magnetic flux density will be doubled
15) which of the following isotope is used to estimate the circulation of blood in a patient a) Carbon-14 b) Carbon-12 c) Phosphorus-32 d) Sodium-23
16) for the radiotherapy of a patient it is required to double the absorbed dose in gray. What step should be taken?a) energy must be quartered b) energy must be halved c) energy must be increased four times d) energy must be doubled
17) which of the following is the proper way to study the sinusoidal waveform of the voltage? a) voltage is connected to X input and the time base is switched of b) voltage is connected to Y input and the time base is switched on c) voltage is connected to Y input and the time based is switched of d) voltage is connected to X input and the time based is switched on
18) cathode ray oscilloscope consists of following parts a) filament, cathode, grid , anode b) cathode, anode, capacitor, screen c) emitter, base, collector, resistor d) resistor, capacitor, inductor
19) if 2A current passes through a resistor when connected to a certain battery. If the resistance is replaced by the double resistance then the current will become a) 2A b) 4A c) 6A d) 1A
20) What is the order of wavelength of x-rays a) 10^-6 b)10"-10 c) 101'
21) A laser beam isa) non coherent b) mono chromatic c) both d) none
22) what is the torque acting on the pendulum of length I. inclined at an angle theta a) mgL b) mgL sin theta c) 0 d) mgL cos theta
23) cathode rays are a) dependent on nature of gas b) depend on target material c) independent on nature of gas d) none
24) I degree is equal to a) A/180 b) 180/J1 c) 211/180 d) /1/57.3
25) if the resistance in the circuit is doubled then what's the current now a) half b) zero c) double d) constant
26) THE HALF LIFE OF A RADIOACTIVE ELEMENT is 1500 yea s the fraction of sample that left after 6000 years a. 1/2 b. 1/16 c. 1/8 dX
27) HALF LIFE OF RADON ISA. 1500YEAR 8. 23.5 MIN C. 3.8 DAYS D. 4'10 ^789
28) in which of the following detyctaLsjgipulse is independent of energy of particle a. GM counter b. solid state c. Wilson cloud d all 0 0
29) THE SHORTEST WAVELENTH OF CONTONOUS X RAY , EMITTED FROM AN X RAY TUBE , DEPEND ON A. I in tube b. Voltage applied c. nature of tube d. atomic number of target
30) 4200 VOLT IS USED in x-ray tube to accelerate electron the speed of x ray a. 2 *101'8 B. 3*10 C2* 10A7 D. r 10'19