MCQOPTIONS
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MCQOPTIONS
This section includes 488 Mcqs, each offering curated multiple-choice questions to sharpen your Uncategorized topics knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Gradient of velocity-time graph gives |
| A. | force |
| B. | frequency |
| C. | wavelength |
| D. | acceleration |
| Answer» E. | |
| 202. |
If we move a positive charge to a positive plate, then potential energy of charge is |
| A. | decreased |
| B. | increased |
| C. | remains constant |
| D. | dissipated |
| Answer» C. remains constant | |
| 203. |
If a current of 1 A passes through a point in 1 s then charge passes that point is |
| A. | 2 C |
| B. | 3 C |
| C. | 1 C |
| D. | 6 C |
| Answer» D. 6 C | |
| 204. |
Benefits of negative feedback include |
| A. | less distortion |
| B. | increased bandwidth |
| C. | low output resistance |
| D. | all of above |
| Answer» E. | |
| 205. |
Bit on left hand side has |
| A. | lowest value |
| B. | zero value |
| C. | highest value |
| D. | infinite value |
| Answer» D. infinite value | |
| 206. |
Acoustic impedance of human skin is {{}} |
| A. | 1.65 106 kg m2 s-1 |
| B. | 1.71 106 kg m-2 s-1 |
| C. | 2 10 6 kg m-2 s-1 |
| D. | 2 107 kg m-3 s-2 |
| Answer» C. 2 10 6 kg m-2 s-1 | |
| 207. |
Gases deviate from gas laws at |
| A. | high temperature only |
| B. | low pressure only |
| C. | high pressure and low temperature |
| D. | low temperature only |
| Answer» D. low temperature only | |
| 208. |
A train with a whistle that emits a note of frequency 800 Hz is approaching an observer at speed of 60 m s-1, the frequency of note heard by observer is {{}} |
| A. | 978 Hz |
| B. | 980 Hz |
| C. | 950 Hz |
| D. | 900 Hz |
| Answer» B. 980 Hz | |
| 209. |
Value of sampled signal is used to produce a |
| A. | binary number |
| B. | decimal number |
| C. | octal number |
| D. | all of above |
| Answer» B. decimal number | |
| 210. |
Elements undergo radioactive decay when proton number becomes greater than |
| A. | 50 |
| B. | 40 |
| C. | 83 |
| D. | 73 |
| Answer» D. 73 | |
| 211. |
Speed v with which wave travels through a medium is given by |
| A. | modulus of elasticity/density of the medium |
| B. | modulus of elasticity/ (density of the medium |
| C. | (modulus of elasticity/density of the medium |
| D. | v=d/t |
| Answer» D. v=d/t | |
| 212. |
Process in which and rays pass close to atoms and knock electrons out is called |
| A. | atomization |
| B. | ionization |
| C. | decay |
| D. | hydroxylation |
| Answer» C. decay | |
| 213. |
Energy of gamma photon is greater than |
| A. | 102 J |
| B. | 10-13 J |
| C. | 1013 J |
| D. | 105 J |
| Answer» C. 1013 J | |
| 214. |
In potential dividers, the output voltage depends upon the |
| A. | single resistor |
| B. | relative values of all resistors |
| C. | current |
| D. | temperature |
| Answer» C. current | |
| 215. |
When temperature rises, resistance of negative temperature coefficient thermistor |
| A. | increases |
| B. | decreases |
| C. | zero |
| D. | infinity |
| Answer» C. zero | |
| 216. |
Average power dissipated in resistor if sinusoidal p.d of peak value 25V is connected across a 20 resistor is |
| A. | 15.6 W |
| B. | 15 W |
| C. | 16 W |
| D. | 17 W |
| Answer» B. 15 W | |
| 217. |
1 N (newton) is equal to {{}} |
| A. | 102 dynes |
| B. | 103 dynes |
| C. | 104 dynes |
| D. | 105 dynes |
| Answer» E. | |
| 218. |
Specific heat of aluminum when 26400 J of energy is supplied to 2 kg block and it's temperature rises from 20 C to 35 C is {{}} |
| A. | 1000 J kg-1 K-1 |
| B. | 70 J kg-1 K-1 |
| C. | 400 J kg1 K-1 |
| D. | 880 J kg -1 K-1 |
| Answer» E. | |
| 219. |
If the total kinetic energy and momentum of a system becomes zero after collision, then the collision is |
| A. | elastic |
| B. | inelastic |
| C. | conserved |
| D. | not conserved |
| Answer» C. conserved | |
| 220. |
In a perfectly inelastic collision, kinetic energy |
| A. | totally disappears |
| B. | is increased |
| C. | is decreased |
| D. | is unchanged |
| Answer» B. is increased | |
| 221. |
In dark, LDR has |
| A. | low resistance |
| B. | high current |
| C. | high resistance |
| D. | both A and B |
| Answer» D. both A and B | |
| 222. |
In a springy collision, if the fast moving trolley collides with a slow one, then the fast one will bounce back at speed of |
| A. | slow one |
| B. | less than slow one |
| C. | more than slow one |
| D. | with the same speed as before |
| Answer» B. less than slow one | |
| 223. |
When white light is passed through cool gases, the spectra observed is called |
| A. | line spectra |
| B. | continuous spectra |
| C. | emission line spectra |
| D. | absorption line spectra |
| Answer» E. | |
| 224. |
In cars, springs are damped by |
| A. | shock absorbers |
| B. | engine |
| C. | tyres |
| D. | brake pedals |
| Answer» B. engine | |
| 225. |
Splitting of white light in to constituent colors is called |
| A. | diffraction |
| B. | refraction |
| C. | reflection |
| D. | dispersion |
| Answer» E. | |
| 226. |
Velocity required by an object to orbit around Earth is{{}} |
| A. | 9 km s-1 |
| B. | 7 km s-1 |
| C. | 8 km s-1 |
| D. | 10 km s-1 |
| Answer» D. 10 km s-1 | |
| 227. |
SI units for energy and work are |
| A. | Joules and kg |
| B. | Joules and meter |
| C. | Joules and newton |
| D. | Joules |
| Answer» E. | |
| 228. |
Attenuation coefficient depends on |
| A. | frequency of x-ray photons |
| B. | wavelength of x-ray photons |
| C. | energy of x-ray photons |
| D. | amplitude of x-ray photons |
| Answer» D. amplitude of x-ray photons | |
| 229. |
There are three equations of uniformly accelerated motion, the odd one out is |
| A. | final_velocity = initial_velocity + (acceleration time |
| B. | distance_moved = (initial_velocity time) + (0.5 acceleration time |
| C. | final_velocity = initial_velocity + (2 acceleration distance_moved |
| D. | final_velocity = initial_velocity + (2 acceleration distance_moved |
| Answer» E. | |
| 230. |
Wavelength of red color is about {{}} |
| A. | 7 10-7 m |
| B. | 7 107 nm |
| C. | 4 10-7 m |
| D. | 4 10-7 nm |
| Answer» B. 7 107 nm | |
| 231. |
Van der Waals derived an expression for the pressure defect , if the observed pressure is denoted as p and volume is denoted as V , the gas pressure in the bulk of the gas is equal to: |
| A. | p + a/V; where a: constant for the particular gas |
| B. | p + a/(V ); where a: constant for the particular gas |
| C. | p + (a V); where a: constant for the particular gas |
| D. | p + (a V ); where a: constant for the particular gas |
| Answer» C. p + (a V); where a: constant for the particular gas | |
| 232. |
An electron is travelling at right angles to a uniform magnetic field of flux density 1.2 mT with a speed of $$$8*10^{6} : ms ^{-1}$$$ , the radius of the circular path followed by an electron is |
| A. | 3.8 cm |
| B. | 3.7 cm |
| C. | 3.6 cm |
| D. | 3.5 cm |
| Answer» B. 3.7 cm | |
| 233. |
On heating a solid, as the separation of atoms increases the potential energy |
| A. | decreases |
| B. | remains constant |
| C. | increases |
| D. | becomes zero |
| Answer» D. becomes zero | |
| 234. |
If current and potential difference are directly related then object follows |
| A. | Ohm's law |
| B. | Faraday's law |
| C. | Ampere's law |
| D. | Kirchhoff's law |
| Answer» B. Faraday's law | |
| 235. |
When a body is moving along a circular path, it's velocity is directed towards |
| A. | center |
| B. | normal |
| C. | tangent |
| D. | parallel to circle |
| Answer» D. parallel to circle | |
| 236. |
Resistance of a particular wire depends upon |
| A. | size and shape |
| B. | shape and length only |
| C. | size only |
| D. | shape only |
| Answer» B. shape and length only | |
| 237. |
Combinations of base units are |
| A. | simple units |
| B. | derived units |
| C. | scalars |
| D. | vectors |
| Answer» C. scalars | |
| 238. |
Satellite around Earth follows a circular path because |
| A. | gravitational force is parallel to velocity |
| B. | gravitational force is anti parallel to velocity |
| C. | gravitational force is perpendicular to velocity |
| D. | gravitational force is anti perpendicular to |
| Answer» D. gravitational force is anti perpendicular to | |
| 239. |
Plank's constant has units {{}} |
| A. | J |
| B. | s |
| C. | J s-1 |
| D. | J s |
| Answer» E. | |
| 240. |
Hardness of x-ray beam can be increased by increasing |
| A. | voltage |
| B. | current |
| C. | frequency |
| D. | wavelength |
| Answer» B. current | |
| 241. |
Attenuation coefficient of bone is 600 m-1 for x-rays of energy 20 keV and intensity of beam of x-rays is 20 Wm-2, then intensity of beam after passingthrough a bone of 4mm is {{}} |
| A. | 3 Wm-2 |
| B. | 2.5 Wm-2 |
| C. | 2.0 Wm-2 |
| D. | 1.8 Wm-2 |
| Answer» E. | |
| 242. |
Speed at which stars and galaxies are moving away from us is determined by phenomena of |
| A. | blue shift |
| B. | yellow shift |
| C. | red shift |
| D. | orange shift |
| Answer» D. orange shift | |
| 243. |
Decrease in strength of signal is known as |
| A. | tuning |
| B. | modulation |
| C. | attenuation |
| D. | amplification |
| Answer» D. amplification | |
| 244. |
x-rays are filtered out of human body by using |
| A. | cadmium absorbers |
| B. | carbon absorbers |
| C. | copper absorbers |
| D. | aluminum absorbers |
| Answer» E. | |
| 245. |
In Hall effect, voltage across probe is known as |
| A. | hall voltage |
| B. | e.m.f |
| C. | potential difference |
| D. | hall potential |
| Answer» B. e.m.f | |
| 246. |
At the end of communication system, the signal is converted from radio to |
| A. | sound |
| B. | mechanical energy |
| C. | kinetic energy |
| D. | potential energy |
| Answer» B. mechanical energy | |
| 247. |
Change in speed of ultrasound causes |
| A. | reflection |
| B. | diffraction |
| C. | refraction |
| D. | image |
| Answer» D. image | |
| 248. |
If a trolley collides with a stationary trolley of double mass, then they move off with |
| A. | half of the original velocity |
| B. | one third of original velocity |
| C. | double the original velocity |
| D. | triple the original velocity |
| Answer» C. double the original velocity | |
| 249. |
Strength of magnetic field of solenoid can be increased by adding core made of |
| A. | copper |
| B. | ferrous |
| C. | silver |
| D. | aluminum |
| Answer» C. silver | |
| 250. |
Acceleration is directly related to |
| A. | displacement |
| B. | negative of displacement |
| C. | velocity |
| D. | negative of speed |
| Answer» C. velocity | |