CISCE Board - ICSE Class 9

ICSE Class 9 Physics Core question bank (Physics)

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Q1.

Radioactivity ($\alpha, \beta, \gamma$ Decays): In 'Measurements and Experimentation: Vernier Callipers and Screw Gauge', when a nucleus emits an $\alpha$-particle ($^4_2\text{He}$):

(A)

Atomic number decreases by 2, mass number decreases by 4 ($^A_Z X \to ^{A-4}_{Z-2} Y + ^4_2\alpha$) (Measurements and Experimentation: Vernier Callipers and Screw Gauge)

(B)

Atomic number increases by 1

(C)

No change in mass or atomic number

(D)

None of these

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Q2.

Current Electricity: What is the internal resistance formula $r$ in 'Measurements and Experimentation: Vernier Callipers and Screw Gauge' for a cell of EMF $\varepsilon$ and terminal voltage $V$?

(A)

$r = \left(\frac{\varepsilon - V}{V}\right) R$ (Measurements and Experimentation: Vernier Callipers and Screw Gauge)

(B)

$r = \frac{{\varepsilon}}{{V}}$

(C)

$r = \varepsilon \cdot R$

(D)

None of these

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