Note: This section included MCQs related to General Forensic Science topics including lie detection and narco analysis.

1. In lie detection, graphs indicate the change in:

  1. Blood pressure
  2. Skin resistance
  3. Pulse rate
  4. All the above

Answer and Explanation

2. The name ‘Keeler’ is associated with

  1. Chromatograph
  2. Polygraph
  3. Spectrograph
  4. Monograph

Answer and Explanation

3. Assertion (A): While taking the photograph of the dead body at the scene of offense a scale should be put by the side of the body.

Reason (R): It would help to calculate the total height of the person.

  1. Both (A) and (R) are correct
  2. (A) is correct, but (R) is incorrect
  3. Both (A) and (R) are incorrect
  4. (A) is incorrect, but (R) is correct

Answer and Explanation

4. Lie detector measures, the following parameters of an individual:

  1. Pulse rate
  2. Blood Pressure
  3. Galvanic skin Resistance
  4. All of the above


5. Which of the following observations are taken into consideration in the lie detection instrument test?

  1. Blood pressure, pulse rate, dilation of pupils, inflammation of the skin
  2. Respiration, blood pressure, pulse rate, galvanic skin response
  3. Galvanic skin response, dilated pupils, respiration, blood pressure
  4. Pulse rate, respiration, dilated pupils, blood pressure


6. In which of the following tests are cardio-cuffs or sensitive electrodes attached to the subject to measure physiological responses such as blood pressure, pulse, respiration, change in sweat gland activity and blood flow?

  1. Brain mapping
  2. Narco-analysis
  3. ESDA
  4. Polygraph test


7. Participation and presence of a medical doctor is mandatory in which of the following?

  1. Brain mapping
  2. Narcoanalysis
  3. DNA analysis
  4. Anthropometry

Answer and Explanation

8. Which of the following is associated with brain mapping?

  1. BAL
  2. EDTA
  3. MDOPA

Answer and Explanation

9. P- waves are associated with which of the following?

  1. Brain fingerprinting
  2. Narcoanalysis
  3. Plethysmograph
  4. Polygraph

Answer and Explanation

10. Which of the following is correctly matched?

Test of Lie detectionAssociated fact
(a) Brain mapping(i) Psychophysiological detection of deception
(b) Truth serum(ii) Recovery of forgotten memories
(c) Lie detector(iii) 3-quinuclidinyl benzilate
(d) Hypnosis(iv) Paracetamol
 (v) Invented by Lawrence Farwell

Answer and Explanation

11. Assertion (A): Narcoanalysis uses sedatives and hypnotics.

Reason (R): Person lies using his imagination.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A)
  2. Both (A) and (R) are true and (R) is not the correct explanation of (A)
  3. (A) is true, but (R) is false
  4. (A) is false, but (R) is true

Answer and Explanation

12. Which drug is used in carrying out ‘nacro analysis’?

  1. Sodium narcol
  2. Sodium amylate
  3. Sodium pentothal
  4. Amphetamine

Answer and Explanation

13. Which of the following physiological parameters is not passed in polygraph testing?

  1. Blood Pressure
  2. Lung air volume
  3. Pulse Rate
  4. Skin conductivity

Answer and Explanation

14. P 300 is generated during the random presentation of a different stimulus along with the frequently repeated presentation of the same stimuli in the case of

  1. Brain fingerprinting
  2. Lie detection
  3. DNA fingerprinting
  4. Nacro Analysis

Answer and Explanation

15. Which of these psychological tests are helpful in such medico-legal situations?

(a) Polygraph
(b) Graphology
(c) Voice analysis
(d) Nacro analysis

Choose the correct option

  1. (a) and (c)
  2. (b) and (d)
  3. (a) and (d)
  4. (a) and (b)

Answer and Explanation

16. A Polygraph test is used for the detection of:

  1. Psychosomatic changes of body
  2. Pharmacological effects on body
  3. Orthopedic changes of body
  4. Radiological effects on body

Answer and Explanation

17. Which of the following drugs are used in Narco-analysis?

A. Sodium Amytal
B. Sodium Pentothal
C. Scopolamine Hydrobromide
D. Atropine Sulphate

Choose the Correct answer from the options given below:

  1. A, B, and D only
  2. A, B, and C only
  3. B, C, and D only
  4. A, C, and D only

Answer and Explanation

18. Which of the following is a tool that reads electrical activity in the brain with electrodes that are placed on the subject’s scalp in brain mapping?

  1. Computer axial tomography (CAT)
  2. Electroencephalography (EEG)
  3. Positron emission tomography (PET) 
  4. Functional MRI (fMRI)

Answer and Explanation

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