Gujarat Board - Class 12 (GSEB HSC) previous year questions (PYQ)

What is the primary engineering function of connecting the metallic body of an appliance to the Earth wire?

Refer to the Case Study 'Case Study: Parabolic Cable Geometry in Civil Engineering Suspension Bridges' to answer:

What is the vertical height of the suspension cable at a horizontal distance of $25\text{ m}$ from the bridge center?

નકશા વાચન: ગુજરાતના નકશામાં 'પ્રાજનનિક સ્વાસ્થ્ય (Reproductive Health)' કયા જિલ્લા કે વિસ્તારમાં આવેલું છે?

આસપાસ (પર્યાવરણ): 'હેલોઆલ્કેન અને હેલોએરીન સંયોજનો (SN1 અને SN2 ક્રિયાવિધિ)' આપણા પર્યાવરણ અને દૈનિક જીવન સાથે કેવી રીતે જોડાયેલું છે?

Directions: In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): Photoelectric emission occurs instantaneously without any measurable time lag ($< 10^{-9}$ s).

Reason (R): In Einstein's photoelectric theory, light interacts as discrete quanta (photons), where a single photon transfers its entire energy to a single bound electron.

Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): Plant stomata close rapidly under severe soil moisture deficit and drought stress.

Reason (R): Abscisic acid (ABA) synthesized during drought induces potassium and anion efflux from guard cells, causing loss of turgor pressure.

Refer to the Case Study 'Case Study: Recombinant Human Insulin Synthesis in Modern Biotechnology' to answer:

Which molecular enzymes are fundamentally required to cut the plasmid vector and seal the insulin cDNA insert?

Refer to the Case Study 'Case Study: Recombinant Human Insulin Synthesis in Modern Biotechnology' to answer:

Which molecular enzymes are fundamentally required to cut the plasmid vector and seal the insulin cDNA insert?

Refer to the Case Study 'Case Study: Parabolic Cable Geometry in Civil Engineering Suspension Bridges' to answer:

What is the vertical height of the suspension cable at a horizontal distance of $25\text{ m}$ from the bridge center?

Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): DNA replication in all prokaryotic and eukaryotic organisms is semi-conservative.

Reason (R): Each daughter double helix retains one intact parental template strand and one newly synthesized complementary strand.

Directions: In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): The number $\sqrt{5}$ is an irrational number.

Reason (R): If a prime number $p$ divides $a^2$, then $p$ divides $a$, where $a$ is a positive integer.

Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): Plant stomata close rapidly under severe soil moisture deficit and drought stress.

Reason (R): Abscisic acid (ABA) synthesized during drought induces potassium and anion efflux from guard cells, causing loss of turgor pressure.

આસપાસ (પર્યાવરણ): 'જૈવવિવિધતા અને સંરક્ષણ (Biodiversity and Conservation)' આપણા પર્યાવરણ અને દૈનિક જીવન સાથે કેવી રીતે જોડાયેલું છે?

Directions: In the following question, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): Step-up transformers are employed at generating stations before transmitting power over long grid lines.

Reason (R): Stepping up voltage reduces transmission current proportionally, minimizing $I^2 R$ Joule heat dissipation losses along overhead conductors.

Directions: In the question below, a statement of Assertion (A) is followed by a statement of Reason (R). Choose the correct option:

Assertion (A): Plant stomata close rapidly under severe soil moisture deficit and drought stress.

Reason (R): Abscisic acid (ABA) synthesized during drought induces potassium and anion efflux from guard cells, causing loss of turgor pressure.