PSTSE Examination 2025-26
Part II: Scholastic Aptitude Test (Science)
91. Butane with the molecular formula C4H10 has:
Correct Answer: (4) 13 Covalent bonds
92. Which enzyme present in pancreatic juice?
Correct Answer: (2) Trypsin
93. In Fleming's left hand rule second finger point the direction of:
[Image of Fleming's left hand rule]
Correct Answer: (3) Current
94. Hair like structure present in respiratory tract is called:
Correct Answer: (2) Cilia
95. The urinary bladder is muscular, it is under:
Correct Answer: (1) Nervous control
96. Anodising is a:
Correct Answer: (4) oxide layer on aluminium
97. Noble Gas:
Correct Answer: (2) Helium, Argon
98. Complete the chemical reaction: CH3-CH2OH → (Hot conc. H2SO4) ?
Correct Answer: (4) CH2=CH2+H2O
99. Litmus solution is a purple dye, it is extracted from:
Correct Answer: (2) lichen
100. Atmosphere of Venus is a made up of:
Correct Answer: (3) clouds of sulphuric acid
101. Formula of Bleaching powder is:
Correct Answer: (4) CaOCl2
102. Match the column I with Column II:
Correct Answer: (2) A-4, B-3, C-2, D-1
| Column I | Column II |
|---|---|
| 1. C5H12 | A. Ethane |
| 2. C4H10 | B. Propane |
| 3. C3H8 | C. Butane |
| 4. C2H6 | D. Pentane |
103. The xylem in plants are responsible for:
Correct Answer: (1) transport of water
104. The gap between two neurons is called a:
[Image of a synapse between two neurons]
Correct Answer: (2) synapse
105. Kala-azar is caused by:
Correct Answer: (1) leishmania
106. Match the column I with Column II:
Correct Answer: (4) A-2, B-1, C-4, D-3
| Column I | Column II |
|---|---|
| A. spirogyra | 1. regeneration |
| B. planaria | 2. fragmentation |
| C. hydra | 3. vegetative propagation |
| D. bryophyllum | 4. budding |
107. Identify the individual whose sex is not genetically determined:
Correct Answer: (3) snail
108. Which mirror is fitted in the wall of Agra fort facing the Taj Mahal:
Correct Answer: (1) convex mirror
109. The S.I. unit of power of lens is:
Correct Answer: (3) dioptre
110. Twinkling of stars is due to phenomenon of:
Correct Answer: (1) atmospheric refraction
111. White silver chloride decomposes into silver and chlorine in sunlight then its colour becomes:
Correct Answer: (4) grey
112. Tooth decay starts when the pH of mouth is:
Correct Answer: (1) < 5.5
113. Which metal is most reactive?
Correct Answer: (4) magnesium
114. The correct structural formula of Propyne is:
Correct Answer: (3) Option 3 (H-C≡C-CH3 structure)
115. Guard cells shrink causing following function:
Correct Answer: (2) Closing of stomata
116. Carbon and its compounds are major sources of:
Correct Answer: (3) fuels
117. CaCO3(s) → (Heat) CaO(s) + CO2(g):
Correct Answer: (4) Decomposition of reaction
118. Image formed by concave mirror when object is between C and F is:
Correct Answer: (3) enlarge
119. The phenomenon of scattering of light by the colloidal particles is known as:
Correct Answer: (2) Tyndall effect
120. Resistance of a metal wire of length 1m is 26Ω at 20°C. If diameter is 0.3 mm, resistivity is:
Correct Answer: (4) 1.84 x 10-6 Ω m
121. Concave lens focal length 15cm. Image at 10cm. Object distance:
Correct Answer: (2) u = -30 cm
122. Melting point of chloroform (CHCl3):
Correct Answer: (3) 209k
123. Wonder of Ancient Indian metallurgy is:
Correct Answer: (1) Iron Pillar
124. The sensitive plant use electro-chemical means to convey information from:
Correct Answer: (2) cell to cell
125. Function of Gibberellins is:
Correct Answer: (3) growth of stem
126. What is the direction of magnetic field lines inside the magnet?
Correct Answer: (4) South pole to North pole
127. Quicklime is used in manufacturing of:
Correct Answer: (3) cement
128. Which gas is used in flush bag of Chips?
Correct Answer: (1) Nitrogen
129. Electric current produces:
Correct Answer: (2) Magnetic field
130. Acidic and basic solution in water conduct electricity because they produces:
Correct Answer: (1) Hydrogen ions and hydroxide ions
