CUET · PHYSICS · PYQ PAPER 2025
The terminal voltages of a cell are found to be 29 V and 28 V when it delivers currents of 1 A and 2 A, respectively. The emf and the internal resistance of the cell are, respectively:
- A 30 V; 2 \( \Omega \)
- B 30 V; 1 \( \Omega \)
- C 32 V; 2 \( \Omega \)
- D 32 V; 1 \( \Omega \)
Answer & Solution
Correct Answer
(B) 30 V; 1 \( \Omega \)
Step-by-step Solution
Detailed explanation
\(V = \epsilon - Ir\) \(29 = \epsilon - 1r \quad (1)\) \(28 = \epsilon - 2r \quad (2)\) \((1) - (2) \implies 29 - 28 = (\epsilon - r) - (\epsilon - 2r)\) \(1 = r\) Substitute \(r=1\) into (1): \(29 = \epsilon - 1(1)\) \(\epsilon = 30 \, \text{V}\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- A potentiometer wire has a uniform potential gradient. The specific resistance of the material of the wire is \(10^{-7} \text{ ohm-m}\), the current passing through it is 0.1 A and its cross-sectional area is \(10^{-6} \text{ m}^2\). What is the value of the potential gradient?CUET 2023 Hard
- A cell of emf 10 V and the internal resistance 1 \( \Omega \) is being charged by an external supply of 100 V. An external resistance of 8 \( \Omega \) is connected to the charging circuit. The current in the circuit isCUET 2025 Easy
- A radioactive substance decays to \( \frac{1}{32} \text{th} \) of its initial activity in 30 days. Its half life period will be:CUET 2023 Hard
- The lateral shift produced by a glass slab during refraction through it, increases with -
(A) the increase in the thickness of the glass slab
(B) the increase in the value of the angle of incidence
(C) the increase in the value of the refractive index of the slab
(D) the increase in the length of the glass slab
Choose the correct answer from the options given below:CUET 2025 Medium - In a full wave rectifier, the output voltage obtained is in the shape of pulsating half sinusoids which are unidirectional but not steady. To get a steady d.c. output
(A) An inductor can be use in series with the load resistor
(B) A capacitor of high value of capacitance can be used in parallel with the load resistor
(C) A capacitor of low capacitance can be used in series with the load resistor(D) Only load resistor is enough to filter out the pulses and convert them to d.c.
Choose the correct answer from the options given below:CUET 2025 Medium - Which of the following statement(s) is/are incorrect?
(A) A current carrying loop may act as a magnetic dipole whose magnetic moment may depend on its area and the number of turns.
(B) A linear solenoid carrying current, may act as a bar magnet.
(C) The magnetic lines of forces due to the current carrying solenoid makes closed curves like in a bar magnet.
(D) The magnetic field inside a solenoid is perpendicular to its axis.
Choose the correct answer from the given options:CUET 2025 Easy
More PYQs from CUET
- Consider the following hypothesis test :
\( H_0 : \mu=18 \)
\( H_1 : \mu \neq 18 \)
If a sample of 48 provided a sample mean \(\bar{x}=17\),
and a sample standard deviation \(\sigma=4.5\),
then the value of the \(t\)-test statistic is :CUET 2025 Easy - Addison's disease is not characterised byCUET 2025 Easy
- An electron (mass \(9 \times 10^{-31} \text{ kg}\) and charge \(1.6 \times 10^{-19} \text{ C}\)) moving with a speed of \(5.0 \times 10^7 \text{ m/s}\) enters a region of uniform magnetic field of strength 0.04 T which is perpendicular to its velocity. The radius of the circular path it follows is:CUET 2025 Medium
- If in a pond there were 20 lotus plants last year and through reproduction 8 new plants are added, taking the current population to 28, then the birth rate will be -CUET 2025 Easy
- The function f defined by \((x)=\left\{\begin{array}{ll}a x+1, & x \leq 3 \\ b x+3, & x>3\end{array}\right.\) is continuous at x = 3 ifCUET 2023 Hard
- Which structure in the microsporangium provides nourishment to pollen grains?CUET 2023 Medium