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Page 1
NTSE STAGE – I (DELHI STATE)
(2020 – 21)
(For Class – X)
SCHOLASTIC APTITUDE TEST
ANSWER KEYS
PHYSICS
101. 3 102. 1 103. 1 104. 2
105. 4 106. 4 107. 2 108. 4
109. 1 110. 2 111. 3 112. 1
113. 2
CHEMISTRY
114. 2 115. 3 116. 3 117. 1
118. 1 119. 3 120. 4 121. 2
122. 2 123. 4 124. 4 125. 4
126. 1
BIOLOGY
127. 3 128. 1 129. 2 130. 4
131. 4 132. 3 133. 2 134. 3
135. 3 136. 2 137. 2 138. 1
139. 1 140. 2
MATHEMATICS
141. 3 142. 2 143. 2 144. 3
145. 3 146. 4 147. 4 148. 1
149. 1 150. 3 151. 4 152. 2
153. 2 154. 2 155. 2 156. 4
157. 3 158. 4 159. 3 160. 1
SOCIAL SCIENCE
161. 1 162. 4 163. 2 164. 2
165. 3 166. 4 167. 3 168. 2
169. 1 170. 3 171. 4 172. 4
173. 1 174. 2 175. 2 176. 3
177. 4 178. 2 179. 3 180. 2
181. 2 182. 1 183. 4 184. 2
185. 1 186. 3 187. 3 188. 3
189. 3 190. 3 191. 4 192. 4
193. 1 194. 1 195. 3 196. 4
197. 2 198. 2 199. 2 200. 4
Page 2
NTSE STAGE – I (DELHI STATE)
(2020 – 21)
(For Class – X)
SCHOLASTIC APTITUDE TEST
ANSWER KEYS
PHYSICS
101. 3 102. 1 103. 1 104. 2
105. 4 106. 4 107. 2 108. 4
109. 1 110. 2 111. 3 112. 1
113. 2
CHEMISTRY
114. 2 115. 3 116. 3 117. 1
118. 1 119. 3 120. 4 121. 2
122. 2 123. 4 124. 4 125. 4
126. 1
BIOLOGY
127. 3 128. 1 129. 2 130. 4
131. 4 132. 3 133. 2 134. 3
135. 3 136. 2 137. 2 138. 1
139. 1 140. 2
MATHEMATICS
141. 3 142. 2 143. 2 144. 3
145. 3 146. 4 147. 4 148. 1
149. 1 150. 3 151. 4 152. 2
153. 2 154. 2 155. 2 156. 4
157. 3 158. 4 159. 3 160. 1
SOCIAL SCIENCE
161. 1 162. 4 163. 2 164. 2
165. 3 166. 4 167. 3 168. 2
169. 1 170. 3 171. 4 172. 4
173. 1 174. 2 175. 2 176. 3
177. 4 178. 2 179. 3 180. 2
181. 2 182. 1 183. 4 184. 2
185. 1 186. 3 187. 3 188. 3
189. 3 190. 3 191. 4 192. 4
193. 1 194. 1 195. 3 196. 4
197. 2 198. 2 199. 2 200. 4
NTSE STAGE – I (DELHI STATE)
(2020 – 21)
(For Class – X)
SCHOLASTIC APTITUDE TEST
HINTS & SOLUTIONS
PHYSICS
101. 3
101. Quality of sound helps to distinguish between two sounds.
102. 1
102. Power (p) =
W mgh 30 9.8 10
t t 60
? ?
? ? = 49 J/s
103. 1
103. R
AB
=
5R
11
R
BC
=
3R
11
R
AC
=
4R
11
104. 2
104. F = kx = 15 × 0.2 = 3 N
F 3
a
m 0.3
? ? = 10 m/s
2
105. 4
105. As slope of v–t graph is decreasing between points A and B. So acceleration is decreasing.
106. 4
106. A retarding force of any magnitude can stop the moving body.
107. 2
107. As, W = VQ
?
18
Q
90
? = 0.2 C
108. 4
108. Magnetic filed lines are closed curve because magnetic monopoles do not exist.
109. 1
109. Average speed =
1 2
S
S 4S
5V 5V
?
?
1 2
2 1
5V V
V 4V ?
Page 3
NTSE STAGE – I (DELHI STATE)
(2020 – 21)
(For Class – X)
SCHOLASTIC APTITUDE TEST
ANSWER KEYS
PHYSICS
101. 3 102. 1 103. 1 104. 2
105. 4 106. 4 107. 2 108. 4
109. 1 110. 2 111. 3 112. 1
113. 2
CHEMISTRY
114. 2 115. 3 116. 3 117. 1
118. 1 119. 3 120. 4 121. 2
122. 2 123. 4 124. 4 125. 4
126. 1
BIOLOGY
127. 3 128. 1 129. 2 130. 4
131. 4 132. 3 133. 2 134. 3
135. 3 136. 2 137. 2 138. 1
139. 1 140. 2
MATHEMATICS
141. 3 142. 2 143. 2 144. 3
145. 3 146. 4 147. 4 148. 1
149. 1 150. 3 151. 4 152. 2
153. 2 154. 2 155. 2 156. 4
157. 3 158. 4 159. 3 160. 1
SOCIAL SCIENCE
161. 1 162. 4 163. 2 164. 2
165. 3 166. 4 167. 3 168. 2
169. 1 170. 3 171. 4 172. 4
173. 1 174. 2 175. 2 176. 3
177. 4 178. 2 179. 3 180. 2
181. 2 182. 1 183. 4 184. 2
185. 1 186. 3 187. 3 188. 3
189. 3 190. 3 191. 4 192. 4
193. 1 194. 1 195. 3 196. 4
197. 2 198. 2 199. 2 200. 4
NTSE STAGE – I (DELHI STATE)
(2020 – 21)
(For Class – X)
SCHOLASTIC APTITUDE TEST
HINTS & SOLUTIONS
PHYSICS
101. 3
101. Quality of sound helps to distinguish between two sounds.
102. 1
102. Power (p) =
W mgh 30 9.8 10
t t 60
? ?
? ? = 49 J/s
103. 1
103. R
AB
=
5R
11
R
BC
=
3R
11
R
AC
=
4R
11
104. 2
104. F = kx = 15 × 0.2 = 3 N
F 3
a
m 0.3
? ? = 10 m/s
2
105. 4
105. As slope of v–t graph is decreasing between points A and B. So acceleration is decreasing.
106. 4
106. A retarding force of any magnitude can stop the moving body.
107. 2
107. As, W = VQ
?
18
Q
90
? = 0.2 C
108. 4
108. Magnetic filed lines are closed curve because magnetic monopoles do not exist.
109. 1
109. Average speed =
1 2
S
S 4S
5V 5V
?
?
1 2
2 1
5V V
V 4V ?
110. 2
110. Refractive index =
C
V
C
n
V
? ?
C
V
n
?
Distance = speed × time
C
t (time)
n
?
Time ?
nt
C
111. 3
111.
eq
20
R
3
? ? ;
max
2.2
I
20
3
?
? ?
? ?
? ?
? 0.33 A
eq
20 110
R 30
3 3
? ? ? ?
min
2.2
I
110
3
?
? ?
? ?
? ?
; I
min
= 0.06 A
112. 1
112.
2
A
V u 2gh ? ?
2
B
V u 2gh ? ?
For C: Vertical velocity
y
V 2gh ?
Horizontal velocity = u
2 2
C x y
V V V ? ?
?
2
u 2gh ?
V
A
= V
B
= V
C
113. 2
113. u = –12
v 5
m
u 2
? ?
? ?
?
V 5
12 2
? ?
?
?
V = –30 cm
1 1 1
v u f
? ? ;
1 1 1
30 12 f
? ?
? ?
? f = –8.6 cm
CHEMISTRY
114. 2
114. ? ? ? ? ? ?
3 2 2
2
2Pb NO 2PbO 4NO O
?
?? ? ? ? ? ?
Page 4
NTSE STAGE – I (DELHI STATE)
(2020 – 21)
(For Class – X)
SCHOLASTIC APTITUDE TEST
ANSWER KEYS
PHYSICS
101. 3 102. 1 103. 1 104. 2
105. 4 106. 4 107. 2 108. 4
109. 1 110. 2 111. 3 112. 1
113. 2
CHEMISTRY
114. 2 115. 3 116. 3 117. 1
118. 1 119. 3 120. 4 121. 2
122. 2 123. 4 124. 4 125. 4
126. 1
BIOLOGY
127. 3 128. 1 129. 2 130. 4
131. 4 132. 3 133. 2 134. 3
135. 3 136. 2 137. 2 138. 1
139. 1 140. 2
MATHEMATICS
141. 3 142. 2 143. 2 144. 3
145. 3 146. 4 147. 4 148. 1
149. 1 150. 3 151. 4 152. 2
153. 2 154. 2 155. 2 156. 4
157. 3 158. 4 159. 3 160. 1
SOCIAL SCIENCE
161. 1 162. 4 163. 2 164. 2
165. 3 166. 4 167. 3 168. 2
169. 1 170. 3 171. 4 172. 4
173. 1 174. 2 175. 2 176. 3
177. 4 178. 2 179. 3 180. 2
181. 2 182. 1 183. 4 184. 2
185. 1 186. 3 187. 3 188. 3
189. 3 190. 3 191. 4 192. 4
193. 1 194. 1 195. 3 196. 4
197. 2 198. 2 199. 2 200. 4
NTSE STAGE – I (DELHI STATE)
(2020 – 21)
(For Class – X)
SCHOLASTIC APTITUDE TEST
HINTS & SOLUTIONS
PHYSICS
101. 3
101. Quality of sound helps to distinguish between two sounds.
102. 1
102. Power (p) =
W mgh 30 9.8 10
t t 60
? ?
? ? = 49 J/s
103. 1
103. R
AB
=
5R
11
R
BC
=
3R
11
R
AC
=
4R
11
104. 2
104. F = kx = 15 × 0.2 = 3 N
F 3
a
m 0.3
? ? = 10 m/s
2
105. 4
105. As slope of v–t graph is decreasing between points A and B. So acceleration is decreasing.
106. 4
106. A retarding force of any magnitude can stop the moving body.
107. 2
107. As, W = VQ
?
18
Q
90
? = 0.2 C
108. 4
108. Magnetic filed lines are closed curve because magnetic monopoles do not exist.
109. 1
109. Average speed =
1 2
S
S 4S
5V 5V
?
?
1 2
2 1
5V V
V 4V ?
110. 2
110. Refractive index =
C
V
C
n
V
? ?
C
V
n
?
Distance = speed × time
C
t (time)
n
?
Time ?
nt
C
111. 3
111.
eq
20
R
3
? ? ;
max
2.2
I
20
3
?
? ?
? ?
? ?
? 0.33 A
eq
20 110
R 30
3 3
? ? ? ?
min
2.2
I
110
3
?
? ?
? ?
? ?
; I
min
= 0.06 A
112. 1
112.
2
A
V u 2gh ? ?
2
B
V u 2gh ? ?
For C: Vertical velocity
y
V 2gh ?
Horizontal velocity = u
2 2
C x y
V V V ? ?
?
2
u 2gh ?
V
A
= V
B
= V
C
113. 2
113. u = –12
v 5
m
u 2
? ?
? ?
?
V 5
12 2
? ?
?
?
V = –30 cm
1 1 1
v u f
? ? ;
1 1 1
30 12 f
? ?
? ?
? f = –8.6 cm
CHEMISTRY
114. 2
114. ? ? ? ? ? ?
3 2 2
2
2Pb NO 2PbO 4NO O
?
?? ? ? ? ? ?
115. 3
115. ? ? ? ?
3 2 3
2
Yellow ppt.
Pb NO 2KI PbI 2KNO ? ?? ? ? ?
116. 3
116. NaHCO
3
+ Tartaric acid
117. 1
117. 3 mole conc. HCl + 1 mole conc. HNO
3
118. 1
118.
2 4
Conc.H SO
3 2 2 2 2
443K
CH CH OH H C CH (Ethene) H O ?? ??? ? ? ? ?
119. 3
119. Denatured alcohol is a mixture of C
2
H
5
OH and CH
3
OH.
120. 4
120. For welding a mixture of oxygen and ethyne is burnt.
121. 2
121. Si < Be < Al < K
122. 2
122. CuO is insoluble in water.
123. 4
123. KO
2
turns red litmus into blue.
124. 4
124. SO
2
is not a green house gas.
125. 4
125. Aluminium does not show allotropy.
126. 1
126. (1) 100 g of He
A
100
25N
4
? ?
(2) 100 g of Na = 4.3 N
A
(3) 100 g of Li = 14.28 N
A
(4) 100 g of Al = 3.70 N
A
BIOLOGY
127. 3
127. ? Absorption of light energy by chlorophyll.
? Breakdown of H
2
O into Hydrogen and Oxygen and Conversion of light energy into
chemical energy
? Reduction of carbon dioxide to carbohydrates.
Page 5
NTSE STAGE – I (DELHI STATE)
(2020 – 21)
(For Class – X)
SCHOLASTIC APTITUDE TEST
ANSWER KEYS
PHYSICS
101. 3 102. 1 103. 1 104. 2
105. 4 106. 4 107. 2 108. 4
109. 1 110. 2 111. 3 112. 1
113. 2
CHEMISTRY
114. 2 115. 3 116. 3 117. 1
118. 1 119. 3 120. 4 121. 2
122. 2 123. 4 124. 4 125. 4
126. 1
BIOLOGY
127. 3 128. 1 129. 2 130. 4
131. 4 132. 3 133. 2 134. 3
135. 3 136. 2 137. 2 138. 1
139. 1 140. 2
MATHEMATICS
141. 3 142. 2 143. 2 144. 3
145. 3 146. 4 147. 4 148. 1
149. 1 150. 3 151. 4 152. 2
153. 2 154. 2 155. 2 156. 4
157. 3 158. 4 159. 3 160. 1
SOCIAL SCIENCE
161. 1 162. 4 163. 2 164. 2
165. 3 166. 4 167. 3 168. 2
169. 1 170. 3 171. 4 172. 4
173. 1 174. 2 175. 2 176. 3
177. 4 178. 2 179. 3 180. 2
181. 2 182. 1 183. 4 184. 2
185. 1 186. 3 187. 3 188. 3
189. 3 190. 3 191. 4 192. 4
193. 1 194. 1 195. 3 196. 4
197. 2 198. 2 199. 2 200. 4
NTSE STAGE – I (DELHI STATE)
(2020 – 21)
(For Class – X)
SCHOLASTIC APTITUDE TEST
HINTS & SOLUTIONS
PHYSICS
101. 3
101. Quality of sound helps to distinguish between two sounds.
102. 1
102. Power (p) =
W mgh 30 9.8 10
t t 60
? ?
? ? = 49 J/s
103. 1
103. R
AB
=
5R
11
R
BC
=
3R
11
R
AC
=
4R
11
104. 2
104. F = kx = 15 × 0.2 = 3 N
F 3
a
m 0.3
? ? = 10 m/s
2
105. 4
105. As slope of v–t graph is decreasing between points A and B. So acceleration is decreasing.
106. 4
106. A retarding force of any magnitude can stop the moving body.
107. 2
107. As, W = VQ
?
18
Q
90
? = 0.2 C
108. 4
108. Magnetic filed lines are closed curve because magnetic monopoles do not exist.
109. 1
109. Average speed =
1 2
S
S 4S
5V 5V
?
?
1 2
2 1
5V V
V 4V ?
110. 2
110. Refractive index =
C
V
C
n
V
? ?
C
V
n
?
Distance = speed × time
C
t (time)
n
?
Time ?
nt
C
111. 3
111.
eq
20
R
3
? ? ;
max
2.2
I
20
3
?
? ?
? ?
? ?
? 0.33 A
eq
20 110
R 30
3 3
? ? ? ?
min
2.2
I
110
3
?
? ?
? ?
? ?
; I
min
= 0.06 A
112. 1
112.
2
A
V u 2gh ? ?
2
B
V u 2gh ? ?
For C: Vertical velocity
y
V 2gh ?
Horizontal velocity = u
2 2
C x y
V V V ? ?
?
2
u 2gh ?
V
A
= V
B
= V
C
113. 2
113. u = –12
v 5
m
u 2
? ?
? ?
?
V 5
12 2
? ?
?
?
V = –30 cm
1 1 1
v u f
? ? ;
1 1 1
30 12 f
? ?
? ?
? f = –8.6 cm
CHEMISTRY
114. 2
114. ? ? ? ? ? ?
3 2 2
2
2Pb NO 2PbO 4NO O
?
?? ? ? ? ? ?
115. 3
115. ? ? ? ?
3 2 3
2
Yellow ppt.
Pb NO 2KI PbI 2KNO ? ?? ? ? ?
116. 3
116. NaHCO
3
+ Tartaric acid
117. 1
117. 3 mole conc. HCl + 1 mole conc. HNO
3
118. 1
118.
2 4
Conc.H SO
3 2 2 2 2
443K
CH CH OH H C CH (Ethene) H O ?? ??? ? ? ? ?
119. 3
119. Denatured alcohol is a mixture of C
2
H
5
OH and CH
3
OH.
120. 4
120. For welding a mixture of oxygen and ethyne is burnt.
121. 2
121. Si < Be < Al < K
122. 2
122. CuO is insoluble in water.
123. 4
123. KO
2
turns red litmus into blue.
124. 4
124. SO
2
is not a green house gas.
125. 4
125. Aluminium does not show allotropy.
126. 1
126. (1) 100 g of He
A
100
25N
4
? ?
(2) 100 g of Na = 4.3 N
A
(3) 100 g of Li = 14.28 N
A
(4) 100 g of Al = 3.70 N
A
BIOLOGY
127. 3
127. ? Absorption of light energy by chlorophyll.
? Breakdown of H
2
O into Hydrogen and Oxygen and Conversion of light energy into
chemical energy
? Reduction of carbon dioxide to carbohydrates.
128. 1
128. Lion
Grass
Insects
Deer
Monkey
129. 2
129. In stratosphere the ozone is formed naturally through the interaction of solar ultraviolet
radiation with molecular O
2
.
130. 4
130.
Column-I Column-II
(i) Regeneration (d) Planaria
(ii) Rhizophus (e) Spores
(iii) Plumule (a) Shoot
(iv) Rose (c) Vegetative Propagation
(v) Stigma (b) Pollen grain
131. 4
131. The opening and closing of stomata regulated by water in guard cells.
132. 3
132. Total = 2432 seeds
2432
152
16
?
Dihybrid cross ratio = 9 : 3 : 3 : 1
152 ? 9 = 1368
Yellow round – 9
Yellow wrinkled – 3
Green round – 3
Green wrinkled – 1
133. 2
133. The stakeholders of various forest products are:
? People living near forests
? Government only
? Nature lovers
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Oct 24, 2025
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