Free Physics and Imaging Modalities practice for NEET PG and INI-CET Radiology, with a written explanation on every question.
7 questions · Free explanations
Showing 1–7 of 7 questions
Q1 · Imaging Principles
NEET PGEasyExplanation
MRI uses a strong magnetic field and radiofrequency pulses, not ionising radiation, and is therefore preferred where radiation avoidance matters, such as in pregnancy, children, and repeated imaging. Ultrasound is also radiation-free. X-ray, CT, and fluoroscopy all use ionising radiation.
Q2 · Radiographic Density
EasyExplanation
Radiographic density increases from air (blackest) to fat, to soft tissue and water, to bone, to metal (whitest). Denser tissues absorb more X-rays, so less reaches the detector and the area appears white.
Q3 · Ultrasound
NEET PGEasyExplanation
Ultrasound uses high-frequency sound waves; reflected echoes from tissue interfaces build the image. It is safe, real-time, and radiation-free, making it first-line in obstetrics and for many abdominal and soft-tissue questions.
Q4 · CT Principles
MediumExplanation
CT attenuation is measured in Hounsfield units, with water set at 0, air about -1000, fat negative, and bone strongly positive. These values help characterise tissues such as fat, fluid, calcification, and acute blood.
Q5 · MRI Sequences
HardExplanation
On T2-weighted images, water and fluid such as CSF and oedema appear bright. On T1-weighted images, fluid is dark and fat is bright. Recognising fluid-bright versus fluid-dark distinguishes the two basic sequences.
Q6 · Radiation Safety
NEET PGMediumExplanation
ALARA, As Low As Reasonably Achievable, is the guiding principle of radiation protection — justify each exposure, optimise the dose, and use shielding and distance. It underlies preferring non-ionising modalities where appropriate.
Q7 · Doppler Ultrasound
MediumExplanation
Doppler ultrasound detects motion, chiefly blood flow, assessing vascular patency, direction, and velocity — for example in diagnosing deep vein thrombosis, carotid stenosis, or testicular and ovarian torsion, where flow is absent.
Physics and Imaging Modalities sits within Radiology, which carries the same syllabus in both exams. This set runs to 7 questions, each tagged Easy, Medium or Hard, 1 of them at Hard, and 3 drawn from previous-year papers.
Answer first, then read the explanation even on the ones you got right — the reasoning is where Physics and Imaging Modalities marks are actually won, and it is what separates a recalled fact from a question you can solve in a new form. Once the Easy set feels comfortable, filter to Hard to find the gaps Radiology examiners keep returning to.
FAQ
Yes. Every question and explanation in this Physics and Imaging Modalities set is free and open — no login, no form and no payment. The explanation appears the moment you answer.
Physics and Imaging Modalities sits within Radiology, which appears in the same form in both syllabuses. Image-based radiology for NEET PG, built on named signs, the tuberculosis patterns and the CT head distinctions that recur every cycle.
No. No account, no password, no OTP. Answer in the browser and your answers stay on your device for the session.