ICAR AICE-JRF/SRF (PhD) · India · NTA for ICAR
Original practice questions written to the published syllabus · not past papersICAR AICE-JRF/SRF (PhD) is a PhD, fellowship and lectureship exam run by NTA for ICAR, for candidates in India. Computer-based, 2 hours, 120 questions: Part A 20 (general agriculture, animal husbandry, current events), Part B 50 (core group), Part C 50 (specialised subject). +4 / -1, maximum 480.
Source: icar.org.in.
Checked against the exam body's published information. Formats and fees change; confirm the current edition there before you book.
Mechanism and application: photoelectric versus Compton interactions, deterministic versus stochastic effects, digital receptor physics, Doppler and Bernoulli calculations, Hounsfield units and windowing, MRI weighting, and choosing the right modality for a clinical problem.
X-ray physics and radiation safety, positioning and interpretation, contrast studies, ultrasonography (including reproductive), endoscopy and the basics of CT and MRI.
Our 22 ICAR AICE-JRF/SRF questions in this subject: 4 easy, 9 medium, 9 hard, across 8 units.
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
These 10 were written to ICAR AICE-JRF/SRF and are not shown on any other exam's page.
Using Santes' rule without a grid, estimate the kVp for a part measuring 12 cm at a source-to-image distance of 40 inches.
A. 64 kVp
Santes' rule: kVp = (2 × thickness in cm) + SID in inches + grid factor = (2 × 12) + 40 + 0 = 64 kVp. 52 uses thickness once (12 + 40); 76 adds the thickness again (24 + 40 + 12); 88 uses 4 × thickness. The rule is only a starting point for a chart.
Which interaction of diagnostic X-rays with tissue is the main source of image-degrading scatter and of radiation dose to staff?
C. Compton scatter with outer-shell electrons
In Compton scatter the photon loses part of its energy and changes direction, fogging the image and irradiating people in the room. Photoelectric absorption removes the photon completely and creates contrast. Pair production needs energies above 1.02 MeV, far beyond diagnostic range; coherent scatter is a minor contributor.
A radiograph is made with the source-to-image distance 100 cm and the source-to-object distance 80 cm. A bone measures 25 mm on the image. What is its true size?
D. 20 mm
Magnification = SID / SOD = 100 / 80 = 1.25. True size = image size / magnification = 25 / 1.25 = 20 mm. 31 mm multiplies instead of dividing; 25 mm ignores magnification; 5 mm subtracts.
A shield has a half-value layer (HVL) of 0.25 mm lead for the beam in use. What percentage of the incident radiation is transmitted through 0.75 mm of lead?
D. 12.5%
0.75 mm is 3 HVLs; each halves the intensity: 100 → 50 → 25 → 12.5%. 25% is two HVLs; 33% divides by three; 75% subtracts thickness proportionally.
An absorbed dose of 0.5 Gy expressed in the older unit is:
A. 50 rad
1 Gy = 100 rad, so 0.5 Gy = 50 rad. 5 rad and 500 rad are factor-of-ten slips; 0.5 rad treats the units as equal.
On which basis is a lateral thoracic radiograph named as 'right lateral'?
C. The animal lies in right lateral recumbency, with the right side against the receptor
Lateral views are named for the side nearer the receptor, i.e. the side the animal lies on. In right lateral recumbency the beam actually enters from the left. Lateral views are displayed with the head to the viewer's left.
A Salter-Harris type II fracture involves:
C. The physis and a portion of the metaphysis
Type I: physis only; type II: through the physis and out through the metaphysis (the commonest); type III: physis and epiphysis; type IV: across epiphysis, physis and metaphysis; type V: compression of the physis.
A known recognised complication after cisternal myelography with iodinated contrast, reported more often in large dogs, is:
C. Seizures
Post-myelographic seizures are a recognised complication, more common after cisternal injection and in large dogs. The other complications are unrelated to intrathecal contrast.
In a normal dog, which order of echogenicity, from least to most echogenic, is correct?
A. Renal medulla, renal cortex, liver, spleen
The renal medulla is least echogenic; the renal cortex is iso- or hypoechoic to the liver; the liver is hypoechoic to the spleen. In cats the renal cortex may be hyperechoic because of fat in the tubular cells.
On a CT scan, a region has a linear attenuation coefficient 5% higher than water. What is its approximate CT number?
C. +50 HU
HU = 1000 × (μ − μwater) / μwater = 1000 × 0.05 = +50 HU. +5 and +500 are factor-of-ten slips; −50 has the sign reversed.
This plan follows where our questions actually fall, so the time goes where the marks are likely to be. It is our reading of the syllabus, not the exam body's weighting.
Read the manual chapters for these first and do every worked question you can find on them.
Aim for one sitting per unit, then mixed questions across them.
Learn the definitions, classifications and standard numbers; these units are more often recalled than worked.
Come back to these after a first pass, untimed, and read every explanation, including for the options you rejected.
Do these early in revision so they are fast on the day.
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