UPSC Daily Quiz for 21ˢᵗ July 2026

1) With reference to Long Duration Energy Storage (LDES), consider the following statements:

1. Long Duration Energy Storage (LDES) refers to energy storage systems capable of supplying electricity for 8 hours or more after charging.
2. Pumped Hydro Energy Storage (PHES) is the most mature LDES technology.
3. LDES helps reduce the curtailment of renewable energy.

Which of the statements given above are correct?

2) With reference to Magnetic Levitation (Maglev) trains, consider the following statements:

1. Electrodynamic Suspension (EDS) generally requires the train to attain a minimum speed before stable levitation.
2. In Maglev systems, the elimination of wheel–rail contact removes rolling friction, though aerodynamic drag still acts on the train.
3. Maglev trains can operate on conventional railway tracks after suitable modification of the bogies.

Which of the statements given above are correct?

3) With reference to Qdenga (TAK-003), consider the following statements:

1. It provides protection against all four serotypes of the dengue virus.
2. It can be administered irrespective of prior dengue infection without requiring pre-vaccination serological testing.
3. It is India's first indigenously developed dengue vaccine.

Which of the statements given above are correct?

4) Consider the following statements regarding Dengue:

1. Infection with one dengue virus serotype confers lifelong immunity against all four serotypes.
2. Secondary infection with a different serotype may increase the risk of severe dengue due to Antibody-Dependent Enhancement (ADE).
3. Aedes aegypti mosquitoes are predominantly day-biting vectors.

Which of the statements given above are correct?

5) Which of the following technologies can be classified as Long Duration Energy Storage (LDES)?

1. Compressed Air Energy Storage (CAES)
2. Flow Batteries
3. Hydrogen Energy Storage
4. Gravity Energy Storage

Select the correct answer using the code below: