MCQOPTIONS
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MCQOPTIONS
This section includes 785 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Devices Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Determine the average value of an alternative current (in A) when the peak value of the current is 10 A. |
| A. | 14.14 |
| B. | 10.63 |
| C. | 6.37 |
| D. | 4.36 |
| Answer» D. 4.36 | |
| 202. |
A choke can be represented by a _______. |
| A. | RLC series circuit |
| B. | RL series circuit |
| C. | R circuit |
| D. | RC series circuit |
| Answer» C. R circuit | |
| 203. |
A single phase ac voltage source has 200 V rms and is connected to a load which consumes an active power of 300 W. What is the reactive power consumed by the load if 2.5 A rms current is drawn from the supply? |
| A. | 100 VAR |
| B. | 200 VAR |
| C. | 300 VAR |
| D. | 400 VAR |
| Answer» E. | |
| 204. |
An a.c. source of 1200 V r.m.s. supplies an active power of 1200 W and a reactive power of 1600 VAR to a load. The r.m.s current and the power factor of the load respectively are |
| A. | 10 A and 0.6 |
| B. | 8 A and 0.8 |
| C. | 10 A and 0.8 |
| D. | 8 A and 0.6 |
| Answer» B. 8 A and 0.8 | |
| 205. |
Inductive reactance of a coil may be calculated as: |
| A. | 1/ωL |
| B. | 2πL |
| C. | ωL |
| D. | 2fL |
| Answer» D. 2fL | |
| 206. |
Purely inductive circuit takes power from the ac mains when _____. |
| A. | both applied voltage and current increase |
| B. | both applied voltage and current decrease |
| C. | applied voltage decreases but current increases |
| D. | applied voltage increases but current decreases |
| Answer» D. applied voltage increases but current decreases | |
| 207. |
A 100 V, 50 Hz A.C. supply is applied across a series RLC circuit having R = 10 Ω, L = 100 mH and C = 1000 μF. The current through the circuit will be |
| A. | 4.33∠ – 70.5°A |
| B. | 3.33∠ – 70.5°A |
| C. | 2.33∠ – 50.5°A |
| D. | 1.33∠ – 50.5°A |
| Answer» C. 2.33∠ – 50.5°A | |
| 208. |
A certain R-L series combination is connected across a 50 Hz single-phase ac supply. If the instantaneous power drawn was found to be negative for 2 milliseconds in one cycle, the power factor angle of the circuit must be _____. |
| A. | 9° |
| B. | 18° |
| C. | 36° |
| D. | 45° |
| Answer» D. 45° | |
| 209. |
In purely resistive, purely inductive (L) and purely capacitive circuits, voltage always is ______, _____ and _____ current respectively |
| A. | In phase, leads, leads |
| B. | In phase, leads by 90°, lags by 90° |
| C. | In phase, leads by 450, legs by 90° |
| D. | In phase, leads by 90°, lags by 450 |
| Answer» C. In phase, leads by 450, legs by 90° | |
| 210. |
An alternating current is given by i = 100 sin 314t A. Its average value will be ______. |
| A. | 70.7 A |
| B. | 63.7 A |
| C. | 100 A |
| D. | 50 A |
| Answer» C. 100 A | |
| 211. |
A cosine wave voltage signal has a 10V RMS value and 60Hz frequency. Also at time, t = 0, the value of the voltage signal is equal to its RMS value. Which of the following is the correct mathematical representation of the voltage signal? |
| A. | 10 cos(60t) |
| B. | 10 cos (120πt) |
| C. | 14.14 cos (60t + π/4) |
| D. | 14.14 cos (120πt + π/4) |
| Answer» E. | |
| 212. |
An iron-cored choke coil has an equivalent resistance of 5 Ω. It draws 10 A when the applied voltage is 240 V, 50 Hz. Its inductance and power factor respectively are |
| A. | 7.5 mH and 0.1 (lag) |
| B. | 74.7 mH and 0.1 (lag) |
| C. | 74.7 mH and 0.208 (lag) |
| D. | 7.5 mH and 0.208 (lag) |
| Answer» D. 7.5 mH and 0.208 (lag) | |
| 213. |
Acantholytic cell in pemphigus is derived from - |
| A. | Stratum basale |
| B. | Stratum granulosum |
| C. | Langerhan's cell |
| D. | Stratum spimosum |
| Answer» E. | |
| 214. |
Dennie-Morgan fold is seen in |
| A. | Mastocytosis |
| B. | Seborrheic dermatitis |
| C. | Sarcoidosis |
| D. | Atopic dermatitis |
| Answer» E. | |
| 215. |
Photosensitive lichenoid drug eruption is seen in ....therapy - |
| A. | Tetracycline(old) |
| B. | Rifampicin |
| C. | Streptomycin |
| D. | Gold |
| Answer» E. | |
| 216. |
Toxic shock syndrome is caused by - |
| A. | Pseudomonas |
| B. | E. Coli |
| C. | Staphylococcal infection |
| D. | Streptococcus |
| Answer» D. Streptococcus | |
| 217. |
Multiple hypoaesthetic, hypopigmented macules on right lateral foreman with numerous acid fast bacilli indicative of - |
| A. | Tuberculoid leprosy |
| B. | Lepromatous leprosy |
| C. | Indeterminate leprosy |
| D. | Borderline leprosy |
| Answer» E. | |
| 218. |
Fordyce spots are |
| A. | Ectopic sebaceous glands |
| B. | Ectopic eccrine glands |
| C. | Ectopic apocrine glands |
| D. | Ectopic mucosal glands |
| Answer» B. Ectopic eccrine glands | |
| 219. |
Basal cell degeneration characteristically seen in - |
| A. | Pemphigus |
| B. | DLE |
| C. | Lichen planus |
| D. | Psoriasis |
| Answer» D. Psoriasis | |
| 220. |
Patch test is read after: |
| A. | 2 days |
| B. | 2 hours |
| C. | 4 weeks |
| D. | 2 weeks |
| Answer» B. 2 hours | |
| 221. |
23 year old lady sony develops brown macular lesions over bridge of nose and neck following exposure to light.The probable diagnosis is - |
| A. | Acne rosacae |
| B. | SLE |
| C. | Photodermatitis |
| D. | Chloasma |
| Answer» E. | |
| 222. |
Underlying internal malignancy is not shown by |
| A. | Bullous pyoderma and migratory necrotizing |
| B. | Acanthosis nigricans and Annular erythema |
| C. | Erythema gyratum repens |
| D. | Granuloma annulare |
| Answer» E. | |
| 223. |
Which layer of epidermis is underdeveloped in the VLBW infants in the initial 7 days? |
| A. | Stratum germinativum |
| B. | Stratum granulosum |
| C. | Stratum lucidum |
| D. | Stratum corneum |
| Answer» E. | |
| 224. |
Infections cause of erythematous rashes is - |
| A. | Measles |
| B. | Typhoid fever |
| C. | Yellow fever |
| D. | Malaria |
| Answer» B. Typhoid fever | |
| 225. |
True about Lichen planus - |
| A. | Basal cell degeneration |
| B. | Colloid bodies seen |
| C. | Autommune disease |
| D. | All of the above |
| Answer» E. | |
| 226. |
Tuberculides is seen in: |
| A. | Scrofuloderma |
| B. | Lupus vulgaris |
| C. | Tuberculoris Cutis Orificialis |
| D. | Lichen scrofulosorum |
| Answer» B. Lupus vulgaris | |
| 227. |
Wickham's striae is seen in - |
| A. | Lichen nitiuds |
| B. | Psoriasis |
| C. | Pityriasis rosea |
| D. | Lichen planus |
| Answer» E. | |
| 228. |
A patient presented with scarring alopecia, thinned nails, hypopigmented macular lesions over the trunk and oral mucosa. The diagnosis is - |
| A. | Lichen Planus |
| B. | Psoriasis |
| C. | Leprosy |
| D. | Pemphigus |
| Answer» B. Psoriasis | |
| 229. |
Intra epithelial bulla is seen in - |
| A. | Pemphgoid |
| B. | Dermatitis Herpetiformis |
| C. | Light eruption |
| D. | Pemphigus |
| Answer» E. | |
| 230. |
Circulating lymphocytes are most sensitive to - |
| A. | UV-B |
| B. | UV-A |
| C. | 760-800 mm |
| D. | UV-C |
| Answer» E. | |
| 231. |
Single lesion in skin is seen in which type of leprosy - |
| A. | BL |
| B. | LL |
| C. | TT |
| D. | BT |
| Answer» D. BT | |
| 232. |
Skin TB which involves skin after involving lymph nodes - |
| A. | Lupus Vulgaris |
| B. | Lupus Erythematous |
| C. | Scrofuloderma |
| D. | Lupus Pernio |
| Answer» D. Lupus Pernio | |
| 233. |
All of the following are given for the treatment of Pityriasis versicolor,EXCEPT: |
| A. | Griesofulvin |
| B. | Ketoconazole |
| C. | Selenium sulphide |
| D. | Clotrimazole |
| Answer» B. Ketoconazole | |
| 234. |
The rash in measles occurs first in occurs in the ...region - |
| A. | Post auricular |
| B. | Forehead |
| C. | Neck |
| D. | Chest |
| Answer» B. Forehead | |
| 235. |
Koenen's periungual fibromas are seen in >50% of cases of: |
| A. | Sturge-Weber syndrome |
| B. | Neurofibromatosis |
| C. | Tuberous sclerosis |
| D. | Ataxia telangiectasia |
| Answer» D. Ataxia telangiectasia | |
| 236. |
Most potent anti leprotic drug is - |
| A. | Clofazimine |
| B. | Dapsone |
| C. | Rifampicin |
| D. | Norfloxacin |
| Answer» D. Norfloxacin | |
| 237. |
A patient who is suspected of having injury to the cervical spine should need all of the following views EXCEPT - |
| A. | Upright lateral cervical spine film |
| B. | Crosstable lateral cervical spine film |
| C. | AP cervical spine film |
| D. | Odontoid views |
| Answer» B. Crosstable lateral cervical spine film | |
| 238. |
Reccurent oral ulcers with pain and erythematous halo around them, diagnosis is - |
| A. | Chicken pox |
| B. | Measels |
| C. | Apthus ulcer |
| D. | Herpes |
| Answer» D. Herpes | |
| 239. |
A patient gets reccurent urticaria while doing exercise and on exposure to sunlight. Which of the following is most like causes - |
| A. | Universal dermographism |
| B. | Chronic Idiopathic utricaria |
| C. | Photdermatitis |
| D. | Cholinergic utricaria |
| Answer» E. | |
| 240. |
Lepromin test is Positive in |
| A. | Lepromatous leprosy |
| B. | Indeterminate leprosy |
| C. | Tuberculoid leprosy |
| D. | Histoid leprosy |
| Answer» D. Histoid leprosy | |
| 241. |
Multiple erythematous annular lesions with peripheral collorette of scales arranged predominantly over trunk are seen in: |
| A. | Pityriasis rubra |
| B. | Pityriasis vesicolor |
| C. | Pityriasis lichennoides chonica |
| D. | Pityriasis rosea |
| Answer» E. | |
| 242. |
Acrodermatitis entero pathica is d/t deficiency of - |
| A. | Cu |
| B. | Cr |
| C. | Zn |
| D. | Se |
| Answer» D. Se | |
| 243. |
All are associated with pemphigus except - |
| A. | CLL |
| B. | Thymoma |
| C. | Atrophic gastritis |
| D. | Non - Hodgkins lymphoma |
| Answer» E. | |
| 244. |
Maximum malignant potential is seen in: |
| A. | Epidermal nevus |
| B. | Dermal nevus |
| C. | Junctional nevus |
| D. | Blue nevus |
| Answer» D. Blue nevus | |
| 245. |
All are dermatological manifestations of dermatomyositis except - |
| A. | Periungual telangiectasis |
| B. | Salmon Rash |
| C. | Gottron's patches |
| D. | Mechanic's hands |
| Answer» C. Gottron's patches | |
| 246. |
Babloo a 5 yrs baby present with small hypopigmented scaly muscle on cheek. Some of his classmates also have similar lesions. The most probable diagnosis is - |
| A. | Indeterminated leprosy |
| B. | Pityriasis alba |
| C. | Pityriasis Rosea |
| D. | Pityriasis versicolour |
| Answer» C. Pityriasis Rosea | |
| 247. |
Skin lesions commonly seen in tuberous sclerosis include all of the following EXCEPT - |
| A. | Hypopigmented spots |
| B. | Adenoma sebaceum |
| C. | Shagreen patch |
| D. | Acanthosis nigricans |
| Answer» E. | |
| 248. |
Satellite lesions are seen in - |
| A. | Borderline leprosy |
| B. | Indeterminate leprosy |
| C. | Tuberculoid leprosy |
| D. | Borderline tuber culoid leprosy |
| Answer» E. | |
| 249. |
A 24 year old unmarried woman has multiple nodular,cystic,pustular and comadonic lesions on face,upper back and shoulders for 2 years.The drug of choice for her treatment would be: |
| A. | Isotretinoin |
| B. | Acitretin |
| C. | Azithromycin |
| D. | Doxycycline |
| Answer» B. Acitretin | |
| 250. |
Dimple sign is seen in ? |
| A. | Eosinophillic fasciitis |
| B. | Dermatofibroma |
| C. | Lipoma |
| D. | Fibroma |
| Answer» C. Lipoma | |